Dr. Jennifer Rodger - #31 - August 2, 2025
Show Notes: The Neurostimulation Podcast – Episode #30 with Dr. Jennifer Rodger
Guest: Dr. Jennifer Rodger, Professor at the University of Western Australia and Head of the Brain Plasticity Research Group at the Perron Institute
Release Date: August 2, 2025
Episode Overview:
In this episode, host Michael Passmore sits down with Dr. Jennifer Rodger, a leading neuroscientist whose lab is pioneering research into the mechanisms and safety of low-intensity, repetitive transcranial magnetic stimulation (rTMS), especially in the developing brain.
Dr. Rodger shares her unique journey from biochemistry to neuroscience, her initial skepticism about TMS, and how her team’s animal model research is helping to unravel the effects and potential of rTMS in both clinical and research settings. The conversation covers:
The challenges and breakthroughs in miniaturizing TMS coils for animal studies
Key findings from recent studies on rTMS in adolescent mice, including effects on brain plasticity and behavior
The translational bridge between animal research and human clinical applications, especially for youth and neurodevelopmental disorders
The importance of safety, evidence-based innovation, and publishing negative results in scientific research
The future of tailored neurostimulation protocols and the need for collaboration across labs and disciplines
Key Takeaways:
rTMS shows promise for treating neuropsychiatric conditions in youth, but careful, long-term research is essential to ensure safety and efficacy.
Animal models provide valuable insights into the mechanisms and potential risks of neurostimulation, especially during critical developmental windows.
Publishing negative results is crucial for scientific progress and helps guide future research directions.
The field of neurostimulation is rapidly evolving, with opportunities for more personalized and integrated treatment approaches.
Resources & Links:
Dr. Rodger’s lab and research group:
https://brainplasticitylab.org/
https://www.perroninstitute.org/research/research-groups/jennifer-rodger/
https://www.perroninstitute.org/research/our-focus-areas/brain-plasticity/
Recent publications and studies discussed:
Our first low intensity rTMS paper is:
Rodger J, Mo C, Wilks T, Dunlop SA, Sherrard RM. Transcranial pulsed magnetic field stimulation facilitates reorganization of abnormal neural circuits and corrects Behavioral deficits without disrupting normal connectivity. FASEB J. 2012 Apr;26(4):1593-606. https://pubmed.ncbi.nlm.nih.gov/22223750/
Description of miniaturised coil design:
Tang AD, Lowe AS, Garrett AR, Woodward R, Bennett W, Canty AJ, Garry MI, Hinder MR, Summers JJ, Gersner R, Rotenberg A, Thickbroom G, Walton J, Rodger J. Construction and Evaluation of Rodent-Specific rTMS Coils. Front Neural Circuits. 2016 Jun 30;10:47. https://pubmed.ncbi.nlm.nih.gov/27445702/
An exhaustive recent review of low intensity rTMS:
Moretti J, Rodger J. A little goes a long way: Neurobiological effects of low intensity rTMS and implications for mechanisms of rTMS. Curr Res Neurobiol. 2022 Feb 23;3:100033. https://pubmed.ncbi.nlm.nih.gov/36685761/
The work exploring rTMS and endogenous brain activity:
Poh EZ, Green C, Agostinelli L, Penrose-Menz M, Karl AK, Harvey AR, Rodger J. Manipulating the Level of Sensorimotor Stimulation during LI-rTMS Can Improve Visual Circuit Reorganisation in Adult Ephrin-A2A5-/- Mice. Int J Mol Sci. 2022 Feb 22;23(5):2418. https://pubmed.ncbi.nlm.nih.gov/35269561/
The recent paper about rTMS in adolescent mice is:
Tomar M, Pow JJ, Penrose-Menz MA, Beros JL, Miljevic A, Meloni B, Rodger J. Low intensity rTMS in adolescent mice affects visuomotor behaviour with no impact on visual topography. Brain Stimul. 2025 May-Jun;18(3):965-974. https://pubmed.ncbi.nlm.nih.gov/40306617/
NB: All research involving animal models was conducted with institutional research ethics board review and approval.
Additional reading on rTMS and neurostimulation:
https://www.mayoclinic.org/tests-procedures/transcranial-magnetic-stimulation/about/pac-20384625
https://my.clevelandclinic.org/health/treatments/17827-transcranial-magnetic-stimulation-tms
Connect with Us:
If you enjoyed this episode, please like, subscribe, and leave a review. Share your questions or comments below, and check out the show notes for links to Dr. Rodger’s work and related resources.
Stay tuned for more conversations at the intersection of neuroscience, innovation, and clinical practice!
The Neurostimulation Podcast – Exploring the science, therapies, and future of brain health.
Transcript
Welcome back to the Neurostimulation Podcast, where we dive into the
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:science, innovation, and clinical
frontiers of neurostimulation.
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:I'm Michael Passmore, and today we're
going to be having a great conversation.
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:I'm thrilled to be speaking with Dr.
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:Jennifer Rodger, professor at the
University of Western Australia, and
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:head of the Brain Plasticity Research
Group at the Perron Institute.
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:Dr.
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:Rodger's lab is pioneering research
into the mechanisms and safety of low
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:intensity, repetitive transcranial
magnetic stimulation or rTMS,
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:particularly in the developing brain.
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:So we're going to be discussing, among
other things, a recent study that explored
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:the effects of rTMS on adolescent mice,
what it reveals about brain plasticity
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:during critical developmental windows,
and perhaps the broader implications
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:for using neuromodulation in younger
humans as well for clinical purposes and
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:also other types of research endeavors.
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:Dr.
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:Rodger, thank you so much for joining us.
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:It's really a pleasure, to
meet you and I'm really looking
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:forward to the conversation today.
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:Jenny: Thank you, Michael, me as well.
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:Mike: Great.
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:So maybe, if you don't mind, taking
a few minutes just to introduce
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:yourself to us and help the audience
to understand, a bit more about you,
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:your work and your experience and what
your lab is focusing in on these days.
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:Jenny: Yeah.
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:Thank you.
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:Please call me Jenny.
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:I'm a neuroscientist and I'm
based in Western Australia, in the
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:city of beautiful city of Perth.
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:And I suppose my background's a little
bit unusual because I come from a
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:biochemistry background, so I studied
organic chemistry and biochemistry
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:and molecular biology, but I always
wanted to get into neuroscience.
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:And, over the years I've studied
a range of different animal models
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:of neuroscience, so I've always
had an interest in development.
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:Brain plasticity, how the
brain repairs after injury.
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:and as you know, I developed my own
research stream emerging through postdocs
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:and, various different lab experiences.
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:rTMS was a sort of mystery to me,
and I, I have to admit that I was
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:a TMS skeptic when I first started
working in this, in this field.
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:And I had a number of people around
me who were saying, it's amazing.
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:It changes the brain, we can use
it to treat all of these things.
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:And I was very skeptical.
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:And when, a colleague challenged me
and said, well, what would it take
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:for you to believe in, in TMS to
really believe that it, it works?
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:I said, well, you know, we, we should
look in animal models because we can
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:actually then get inside the brain and
look at pathways and look at cells and
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:see the effects of TMS on the brain.
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:And, that would convince me
if we could see things and.
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:So we applied for a grant and we got the
grant, and that's where my, research focus
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:now is based around TMS understanding
how it works, how it can be applied,
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:and that all stems from that initial
argument and, and that grant application
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:to, to convince myself that our TMS was
actually having an effect on the brain.
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:So now my research extends not only
in the mechanisms, but we started
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:working in translational neuroscience,
trying to find ways to translate
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:basic findings into human practice.
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:It's, it's challenging.
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:I can't say we've had any major
successes yet, but it's been really
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:fascinating journey and I look forward
to talking, about lots of different
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:aspects of this with you today.
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:Mike: Yeah.
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:Fantastic.
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:That's so interesting.
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:Thanks so much for explaining that.
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:I think it's.
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:Yeah, I've talked to so many people
who, myself included, who, have been
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:skeptical about neurostimulation.
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:And I think part of what's interesting
is because I'm thinking of this, I'll
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:put it up, I, I'll show this picture
that I'm thinking of, but it has to do
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:with the history of magnetism and, and
how, a hundred years ago people were
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:doing things putting magnets towards the
head and, and, and so it does engender a
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:sense of skepticism and that's it lends
people understandably to wonder to what
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:extent this is a scam or there's snake
oil kinds of clinical applications.
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:And I think even currently there's,
there's this potential for, unscrupulous
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:people to be producing devices that are
nothing more than sham But now 20 years
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:on after, really it's been starting to
kind of catch on clinically, there's
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:so much evidence and understanding
more about the basic research, that,
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:that you and your team are, are
involved with is extremely interesting.
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:Yeah.
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:So I'm looking forward
to talking about it also.
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:Jenny: Thank you.
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:Yeah.
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:I think it's also TMS is unusual, as
you pointed out, that it sort of, it
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:happened and the medical device suddenly
became used and employed everywhere.
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:And unlike a, a drug or, you know,
most common interventions, there
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:hasn't been that body of evidence
built up before translating to humans.
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:So it's almost working backwards.
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:And now we've got something that works
sort of most of the time or some of
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:the time, uh, going backwards and
trying to understand why it works and
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:why it doesn't work in some cases.
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:I think it's, it's, it's
a really interesting area.
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:Mike: Yeah.
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:Yeah.
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:And, and just thinking about, this
particular study in terms of the animal
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:model, it does bring back memories.
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:I did some work study kinds of,
terms in, in undergrad in animal
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:biology lab at UBC in Vancouver here.
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:And so I, I can recognize the value
of this kind of research, and I'm
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:particularly curious about the
logistics of developing miniature
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:TMS coils, rodent sized coils.
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:So help, help me understand
how that all worked.
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:That must have been an
interesting journey.
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:Jenny: It was a very interesting journey.
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:I, I have, when, when I give talks, I
have a slide where I show a human head
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:with a human TMS coil and saying, and
so, you know, I got this grant and we
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:were funded to do TMS in, and I put up
a, a mouse to scale with the human head.
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:And everybody laughs because you see how
huge the coil is relative to the mouse.
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:And there's no way that we could use
a human coil, at least in my opinion.
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:And having spoken with a lot of
other people, the whole, the strength
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:I think of human TMS is that it
delivers focal stimulation to a
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:particular place in the brain so that
you can target particular networks
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:and, you know, alter connectivity.
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:And that as we know more
about it, we think that that
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:vocality is really important.
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:But when you try and do that in
a mouse with a big coil, you're
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:stimulating the whole animal.
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:So it was really important for us to try
and find a way to miniaturize the coils.
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:And two people really
were instrumental in that.
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:A colleague, professor Rachel
Sherrod, who works in Paris, she
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:was the one who actually said, we
need to miniaturize these coils.
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:And she developed some prototypes and.
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:Had lots of long chats and arguments
about it, but then I had an amazing PhD
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:student, Alex Tang, who's now got his own
lab in TMS and brain aging particularly.
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:And for his PhD he worked with the
physics department at our university
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:in wound coils on a proper coil
wounder, and developed some modeling
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:skills using the electromagnetic
field modeling programs like console.
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:It was before things
like Simin nibs existed.
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:So it was, it was really hardcore
physics and, electromagnetism
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:theory that we got into.
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:And it took him, the best part of
a year to get a working prototype.
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:We had to buy power supplies, we had
to buy waveform generators, look at
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:the different shapes of the pulses.
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:and yeah, it was, it was quite a journey.
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:But those small coils.
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:Fantastic because they can stimulate
a quarter of a, a mouse brain, which
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:I think is, it's not as good as
in humans, but it's getting there.
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:The only disadvantage is that because
the coils are small, the intensity
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:of the magnetic field is very weak,
so that means that we can't replicate
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:motor evoked potentials that are such,
classic conventions in human TMS.
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:We can't deliver stimulation at the
intensities that are clinically relevant.
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:So that's led us to take a
number of, different pathways.
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:In the study that you spoke about looking
at developing brains, we've had to focus
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:on that concept of peri focal stimulation
because even though you have a core of
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:high intensity stimulation at the hotspot.
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:There's a surrounding, I don't want
to say aura, but lower intensity
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:emanation of magnetic field around
that hotspot, which is still activating
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:brain cells and having an impact.
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:So from that point of view, I
think the coils can be useful in
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:understanding some aspects of TMS,
but it's clearly not a perfect model.
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:But then no model's perfect.
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:Mike: Right?
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:Yeah.
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:Well it's, it's interesting just
by itself in terms of what affects
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:that type of magnetic field.
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:And what the observations are and how
those changes might then be relevant
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:in terms of clinical applications.
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:Jenny: Exactly.
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:I hope that it's contributing.
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:Sometimes I ask myself, how relevant these
models really are, but then you there,
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:if we can get effects with low intensity
magnetic fields, then do we really
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:need high intensity magnetic fields?
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:Are there opportunities to change
the parameters and explore other
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:mechanisms that might have.
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:More impact in other disorders or have
different effects on brand cells, mm-hmm.
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:Again, I think all of that
discovery is important.
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:Mike: Yeah, for sure.
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:And I think it makes sense just
in terms of understanding the
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:emerging breadth of potential.
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:Neurostimulation applications, that
are coming out, whether it's tDCS or
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:transcranial focused ultrasound or so.
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:So it's clearly not just limited
to, the specificity of focal, High
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:frequency or low frequency rTMS in a
human model, So it's super interesting.
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:So then, given what you were just saying,
what kinds of, I guess, maybe if it's
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:presumptuous to ask or if we're not quite
there yet, but what do you envision then
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:as perhaps a potential translational
bridge between what you've learned with
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:the rodent studies and potential clinical
applications for humans down the road?
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:Jenny: Well, I suppose the most advanced,
example of that is work that we've
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:done with Kaylene Young, a colleague
in Tasmania at the Menzies Institute.
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:And a few years ago we started working
out what is TMS doing not only to
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:neurons, but also to other brain cells.
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:and the brain isn't
just made up of neurons.
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:They're astrocytes, they're
oligodendrocytes, but all the
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:blood vessels, microglia and their,
colleagues in Germany who are doing
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:a lot of work around microglia.
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:But the work with Kaylene was
interesting 'cause we focused
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:particularly on oligodendrocytes.
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:Her lab is expert in multiple sclerosis
research, and she found that the low
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:intensity stimulation would improve
the survival of oligodendrocytes.
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:And in mouse models of multiple sclerosis,
it will improve, remyelination, it
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:will increase the amount of myelin that
they produce, that the cells produce.
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:So it's actually a completely unexpected
outcome of rTMS Electromagnetic
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:stimulation of the brain has the potential
to improve myelination and then we've
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:translated the circular coils and mice,
stimulating large areas of the brain in
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:humans, we've measured equivalent magnetic
fields so that the, the cortex of the
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:mouse was receiving a certain intensity.
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:And we've matched that in humans
through, again, a lot of modeling and
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:back of the envelope, calculations.
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:And we're in, phase two clinical trials
now, looking at efficacy of that.
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:So for us, for me, it's not really
my story, it's Kaylene's story, but
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:it's been a great privilege to be
involved in that and see how some
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:really basic questions that our devices
help to ask have actually led to some
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:new innovations in, in human trials.
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:So I'm hoping that for things
like depression and anxiety,
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:our work will again, contribute
to that in, in the future.
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:But I think there's a lot of potential
for it, for there to be a strong
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:translational pipeline between
the animal models and the human.
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:Mike: Mm-hmm.
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:Yeah.
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:Yeah.
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:Absolutely.
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:That's fascinating.
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:I think that's really interesting to
think about how these technologies are
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:affecting systems in the brain, aside
from the neuronal systems and pathways
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:and connectivity and neuroplasticity,
these, the glial cells are often just
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:underrecognized in terms of their
importance I'm sure it's just a limitless
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:kind of area for, for investigating
with these kind of technologies
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:. So the other part of it that I
was fascinated by, is just this
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:idea of the, the impact of the
TMS on the, the developmental
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:piece, you know, the, the, the
neurodevelopmental sort of change there.
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:So I'm just curious if you don't
mind, you know, that particular study,
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:so as I understand it was targeting
visual cortex during an important
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:period of the mouse development.
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:So can you tell us a little bit
about that and what, what the study
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:basically yielded in terms of findings?
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:Jenny: Yeah.
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:That, that's the study that we're, we're
particularly interested in at the moment.
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:you know, TMS is approved in adults for
treating major depressive disorder and one
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:of the real attractions I think of TMS is
that there are very few side effects and
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:we know that young people who experience
depression and anxiety are, they really
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:don't respond to medications very well.
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:The medications are often developed in
adults, they're not well adapted to use.
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:There's a lot of side effects.
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:youth themselves feel a little bit
disempowered when they just get given a
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:pill and told to go away and get better.
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:So there's a lot of interest in
trying to find new treatments.
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:And TMS is, has been
trialed in young people.
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:There's reasonable, I'd say
actually very good safety evidence
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:that there are no side effects
beyond what you see in adults.
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:And the young people tolerate it well
and they seem to respond reasonably well.
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:The efficacy, I think, is
still not particularly.
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:There's not a lot of evidence yet
for the efficacy, but because the,
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:the developing brain in humans,
the brain continues to develop, to
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:develop until roughly the age of 25.
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:So if you're stimulating the brain in a
young person, it, it is an opportunity
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:that, could be fantastic because the
brain is very plastic in a teenager.
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:Or in a child.
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:So you have great potential to modify
it and to, repair anything that
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:might be, abnormal circuitry or neuro
develop neurodevelopmental disorders.
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:But you also have a big risk
that any changes you make in
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:that period have the potential to
affect lifelong brain functioning.
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:And in humans, we've had
TMS in the population for
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:probably more than 20 years.
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:So I think there's a lot of
confidence in adults that we're not.
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:Predisposing people to neurodegenerative
conditions, and we're not causing
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:lesions, and we're not altering
DNA or giving people cancer.
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:So we're confident about that for adults.
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:But children really are, I don't want to
say vulnerable, but susceptible to change.
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:And one of the questions that we've
had from speaking to young people
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:with anxiety and depression is we
love the idea of TMS, but what am,
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:what's my brain going to look like in
20 years or in 30 years when I'm 80?
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:Is it going to impact, who I am
and, and how my brain works later?
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:So we thought, well we can't
do that in people 'cause it's,
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:nobody's gonna fund us for 50 years.
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:Much as we would love to
get funded for 50 years.
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:It's not going to happen.
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:So we thought animal models are
a perfect way to look at this.
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:We can take a young mouse.
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:the adolescent period is
roughly up to about 40 days.
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:give the animal TMS during that
period and then just see what happens.
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:And the paper that you mentioned that we
published in brain stimulation last month
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:really describes that short term outcome.
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:So we did the very simple experiment.
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:We gave the animal our low intensity
stimulation, arguing again, that we're
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:looking because we can't deliver the focal
stimulation to the prefrontal cortex mass,
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:we can still deliver the peri focal, the
low intensity that a child would receive.
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:And we stimulated the visual cortex
because in mice it's very difficult to
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:measure things like mood and depression,
and those models are quite controversial.
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:Whereas in the visual system,
you've got a great readout of, the
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:organization of the visual system
connectivity, because there's a point
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:to point mapping between the retina
and all of the visual brain centers.
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:So the actual connectivity
is easy to measure.
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:You then also have a behavioral readout.
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:Can the animal still see, can
it respond to visual stimuli?
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:So although it does abstract the
model away from humans, it's actually
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:a really powerful model because it
allows us to examine the anatomy, the
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:cellular composition and the behavior.
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:I suppose in the reverse order.
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:You look at the behavior first,
and then in those same animals,
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:you can euthanize the animals and
then examine the brain structure.
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:So that was the idea behind the study that
we wanted a really clear readout of the
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:structure and function of the brain after
it had received TMS during development.
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:So we were the results are compelling and
we were still there's a lot more to do
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:in a nutshell, there were no, there was
no impact that we could find on any of
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:the anatomical organization of the brain.
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:There were no changes to any of
the neurotransmitter markers,
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:but I'll come back to that later.
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:There didn't seem to be any inflammation.
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:We used some fairly broad tools to look
at that, but there was a behavioral,
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:change and that really puzzled us
because we didn't expect to see that.
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:And the behavioral
change was very specific.
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:It was, visual motor integration.
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:So when you, the test that we use is
called, an optic kinetic nystagmus test.
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:And all that means is it's basically
your eye tracking movement.
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:So when you sit in a train or a car and
you're looking out the windows, your eyes
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:flick back and forth, as the landscape
passes by, because it's, it's a reflex,
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:we can't really control it that well.
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:but our eyes follow moving objects.
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:And you can do this in mice.
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:You put them in a, a moving circular drum.
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:As the stripes move past the
animal, their heads and eyes track
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:the stripes and you can count the
number of times that they do that.
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:So after TMS, we found that
the mice did less tracking.
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:They essentially didn't follow moving
stripes as often as control mice did.
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:And so we went back to the anatomy and
we looked at the different regions we had
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:traced and found absolutely no change.
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:And there.
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:You know, though we looked
at the main visual pathways,
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:but there are always more.
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:So we can't rule out that other visual
pathways might be disorganized, but
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:because the deficit involved both vision
and movement, I think it's actually a
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:really interesting idea to think that
TMS might have compromised some of
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:that sensory motor integration pathway.
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:So it's not just about vision, it's about
how vision integrates with movement.
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:In development, those
processes are really complex.
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:They're still developing, and it's
possible that by providing stimulation
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:and providing additional activity,
TMS essentially increases the
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:electrical activity in the brain.
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:we could have compromised the development
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:Mike: pathways.
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:Jenny: So is that important?
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:does that strike fear into
my heart for TMS in young,
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:people, it, it honestly doesn't.
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:Partly because we're looking at
a model that's very abstract.
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:we're looking at a visual system.
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:We're looking at sensory pathways,
sensory motor pathways, and the
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:deficit was very small and the deficit
happened immediately after TMS.
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:So we're thinking probably if we stopped
TMS and let the animals just live
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:normally for a couple of weeks, the brain
would probably restore normal function
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:because that's what the brain does, and
especially in young people where the
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:brain remains plastic for a long time.
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:also we don't really know what
would happen in an abnormal brain.
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:So a brain that had, connectivity related
to depression or anxiety like symptoms.
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:But what is the equivalent of
sensory motor integration in those
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:brain regions involved in mood
regulation and emotional processes?
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:So I think it's interesting.
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:It raises questions and it certainly
raises, Just concerns that there
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:is something going on in the young
brain that doesn't probably happen in
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:the same way in, in an adult brain.
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:Mike: Mm-hmm.
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:Yeah, that's really interesting.
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:I mean, it's certainly reassuring
that there were no concerning
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:findings on the cellular and
neurotransmitter and inflammation side.
352
:Yeah.
353
:Mm-hmm.
354
:I can see how there's caution that's
required in terms of interpreting
355
:those behavioral findings in terms of
the applicability to humans For sure.
356
:Jenny: Yeah, I think the, the
neurotransmitter question was tricky.
357
:We, we did additional experiments
in response to reviewer comments
358
:on the paper saying, well, if
it's not anatomy, what is it?
359
:You have to have an explanation.
360
:So we went back and looked at the ex
and inhibitory balance in the brain.
361
:But again, animal experiments are
quite tricky because we wanted to
362
:use the same animals for everything.
363
:So we have the behavioral
outcomes in the animals.
364
:We have the anatomical tracing, and
then in the same brains we actually
365
:studied the neurotransmitter and,
inhibitory excitatory balance.
366
:But after TMS has stopped, by the time
you've done the behavioral experiments
367
:and the anatomical tracing, it takes
about a week to 10 days to do all of that.
368
:So the effects of TMS are already
starting to wear off at the time that
369
:you euthanize the animals and start to
look at the neurotransmitter profiles.
370
:So.
371
:No, we, we were really limited in
how much we could interpret that
372
:because so much time had gone by.
373
:So at the moment we're, you
know, continuing on from,
374
:from those experiments.
375
:We're hoping to do some long-term
studies, not even, three months
376
:after the TMS, but animals live
for roughly 18 months to 24 months.
377
:So that is within the capacity of
a funding body where we can have
378
:studies that TMS mice in youth and
study them all the way into old age.
379
:And that will give us a much more
detailed time course of what's going on.
380
:And we have the capacity also to
take different cohorts of animals to
381
:specifically address questions like
excitatory and inflammatory balance, as
382
:well as, putting them in the MRI machine
scanning, brain connectivity, and, and
383
:getting much bigger picture of what's.
384
:Mike: Yeah.
385
:That's fascinating.
386
:I mean, that totally makes sense
in terms of the next steps and how
387
:to sort out all of these questions.
388
:For sure.
389
:And I think it's, I certainly
feel reassured as well.
390
:I'm glad to hear that
you're, you're being, right.
391
:Immersed in, in this work or are
also reassured around the likelihood
392
:that this is gonna be a safe.
393
:Clinical application in, in
children and adolescents.
394
:And I guess just thinking about the recent
FDA approval of rTMS in adolescents with
395
:major depressive disorder, I think that,
as you said, not only the, the long now
396
:20 plus year history of effectiveness
and safety in adults is, is reassuring.
397
:But I also think, maybe this is
more of a general speculation
398
:based on the idea that.
399
:Young brains are more plastic in general.
400
:It would strike me that, that then would
by itself be a reassuring factor in terms
401
:of, well, if we're, if we're, imposing
this energetic change on the brain in a
402
:therapeutic sense, then hopefully the.
403
:The baseline neuroplasticity of the
developing brain is, is is almost a buffer
404
:that would help to guard against any
long term side effects or, or, or, yeah.
405
:Other morbidity issues that might
some level be conceivably related
406
:to the short term application
of the, of the magnetic field.
407
:Jenny: Yeah, I completely
agree and I think.
408
:Also we, you know, this is a whole
other question, but we don't know
409
:if the same parameters that work in
adults are also effective in humans.
410
:We have a fairly limited, um, well,
the parameters with TMS are unlimited.
411
:You know, any combination of frequency
and intensity and number of pulses, it's
412
:a, it's a bit of a scary, uh, area to go
into 'cause there's so much possibility.
413
:In adults, we've sort of narrowed it
down to maybe two or three frequencies
414
:that we think are effective and that
seem to give good outcomes, whether
415
:those work in children or whether
it's worth actually re-exploring some
416
:of those stimulation parameters to
try and find some, find something
417
:that's more specific to children.
418
:I wouldn't even know how to start
going about that, um, apart from
419
:attacking that huge parameter space.
420
:But I think that it's a bit like
with drugs, we can't just assume
421
:that children are small adults.
422
:You know, they're, they have
different brain chemistry, they
423
:have different brain structure.
424
:Neuroplasticity is hugely
significant at that stage.
425
:So I think, it's important to think
carefully and make sure that we,
426
:we do TMS properly in young people.
427
:Mike: Mm-hmm.
428
:Yeah, it makes sense.
429
:And I think it also makes sense in
terms of what I hear a lot of people
430
:talking about, and it makes perfect
sense, is just this idea of tailoring
431
:protocols to, to an individual's needs.
432
:So whether it's age on, on the young
end or even on the later life end or
433
:other, other aspects of, of particular
neuropsychiatric disorder or other.
434
:I'm not sure.
435
:I mean anything just as, as a
medication, I think probably this is
436
:a limitation of the legacy medication.
437
:I think obviously psychotherapy,
there's more room for tailoring
438
:necessary obviously, but on the
medication side, perhaps not.
439
:Right?
440
:So maybe with a multimodal approach
to treatment with tailored protocols,
441
:depending on what the research shows
across the age spectrum, that it
442
:makes sense that this is the sort
of work that would help to inform
443
:those eventual clinical guidelines
and protocols being accepted.
444
:Jenny: No, absolutely.
445
:And TMS is, is actually really well set up
for TA for being tailored because there's,
446
:choice not only around the region that's
being targeted, but also all of that.
447
:Then sort of electromagnetic parameters
with the pulses and the intensities.
448
:And I think we've seen with things like
the Saint Protocol coming out, that there
449
:is a lot of opportunity for tailoring.
450
:There's quite a lot of excitement
around even just very simple.
451
:Targeted, tailoring brain regions
based on connectivity patterns.
452
:So I think there's, you know, we've
taken the first steps and it's now
453
:open to, to a lot of opportunities.
454
:As you mentioned, I think the combinations
as well, TMS combined with medication, TMS
455
:combined with psychotherapy, those sorts
of, really integrated treatments are, are
456
:really exciting and for youth where we
know, they really want to be involved.
457
:Well, the youth that we've spoken to
in, in Australia, they really want
458
:to be involved in their treatment.
459
:They want to feel like they're empowered
to be part of the decision making process.
460
:And I think the opportunity to tailor
treatments and to get them engaged in
461
:making decisions around that is, is gonna
be really powerful because that will
462
:also support their own mental wellbeing.
463
:Mike: Definitely.
464
:Yeah, definitely.
465
:I think that's a part of the issue
historically with the legacy approaches
466
:is, is exactly as you say, it's that
it's the way that clinicians kind of get
467
:sucked into the whole pharmaco industrial
complex and they're only insured for a
468
:limited amount of time, which makes it.
469
:Easier, shall I say, to write a
prescription and, and then, book
470
:an appointment in a few weeks time
thing, and I can see how already.
471
:Younger, younger folks would be already
disinclined to come in the first place.
472
:And then if that's the sort of
approach, then, they're justified
473
:in having a skepticism around that.
474
:So hopefully these kinds of novel
treatment approaches and more ability
475
:to ask questions and be interested
in the technology that will help
476
:to foster a sense of agency and
involvement with their own treatment.
477
:Definitely.
478
:It's fascinating.
479
:The other thing that's interesting
that I was thinking just now is the
480
:potential for perhaps the tailoring to
involve not only as you were saying,
481
:a given neurostimulation option, plus
medication, plus psychotherapy, but.
482
:Of neurostimulation options like
TMS and then maybe something like
483
:TDCS for maintenance treatment,
something along those lines.
484
:and it's also interesting to think
about, I'm wondering a bit about whether,
485
:whether you're, based, it's probably too
early to say, but if, if, in terms of
486
:thoughts that you and your team had about
future directions to explore with this
487
:kind of research or potential clinical
implications, was there any sense that
488
:there might be some applicability for.
489
:Purely considered neurodevelopmental
disorders, like along the lines
490
:of, say, autistic spectrum
disorder or those sorts of things.
491
:Jenny: Yeah.
492
:We, we've spoken to, there's obviously
a lot of interest in using TMS for
493
:things like autism and A DHD as well
is, is a question that we get a lot and
494
:speaking to clinicians, they say, but,
TMS alters dopamine and it targets these
495
:brain regions and we know from the MRI
studies it, it activates these pathways.
496
:Why aren't you using it for a DHD?
497
:And it, you know, I don't, I
don't know the answer to that.
498
:I think the, again, it's this sort of
clinical trial versus animal models
499
:and, sequence that, we haven't got the
animal, we, there are animal models
500
:for things like autism and A DHD, but.
501
:Again, they don't always model all
the different aspects of, of the human
502
:disorder and treating people with
autism and A DHD is, especially, a
503
:lot of them tend to be young people.
504
:The ethical considerations around
that are are quite complex.
505
:So I think there are a lot of
difficulties in moving into that
506
:space and getting TMS approved for
youth with depression is probably a
507
:first step in moving towards that.
508
:It's the easy way in that population.
509
:Certainly clinicians that we've spoken
to are really excited about possibility
510
:and, parents and children as well.
511
:You know, the people need, I think,
better treatments overall for those
512
:neurodevelopmental disorders, and
TMS certainly has the capacity
513
:to modify the developing brain.
514
:As you know, a lot of people have
shown we're not the only people
515
:who have done work in development
as a lab in, in Germany that did
516
:some work in developing rodents.
517
:looking particularly at the critical
period and they showed some really
518
:interesting effects around the inhibitory
excitatory balance, particularly
519
:paval parvalbumin into neurons.
520
:Alia Benal in class, Funke did some great
work on, characterizing changes in those
521
:in neurons that we know are involved
in autism and regulating activity.
522
:Brain pathways.
523
:So there's a little bit of preclinical
evidence, but translating that.
524
:Complex and you want to get it right.
525
:I think particularly for something like A
DHD where balance, it's all about balance.
526
:Autism probably as well, and, and
it's important to get it right.
527
:Mike: Mm-hmm.
528
:Mm-hmm.
529
:Yeah.
530
:I'm curious in terms of follow up
studies or ideas based on, the, the
531
:study that we're talking about with
the visual cortex development mm-hmm.
532
:would it be feasibly something to
think about in terms of potential for a
533
:follow up study that looks at perhaps.
534
:Such as auditory processing
or executive function.
535
:Thinking about o other aspects of brain
function that are critical for, say,
536
:learning and, and, and success in,
in, in academia or social settings?
537
:Jenny: Mm.
538
:That, that's a great question.
539
:We've, I work with a colleague who's,
an auditory physiologist and we've done
540
:some work on tinnitus and, and TMS.
541
:And I've spoken to her about some way
that we could use the auditory system.
542
:there are techniques like, mismatch
negativity and oddball paradigms
543
:where you can measure the brain's
response to different auditory stimuli.
544
:so we we're we've spoken
about that a little bit.
545
:but you're right.
546
:It's the idea of, of looking at.
547
:More cognitive and emotional type
tasks around executive function
548
:and, social interactions as well.
549
:we're starting to develop
those paradigms in lab.
550
:we're almost spoiled for choice.
551
:I can't say, you know, we've, we've
gone in the direction of extending
552
:the timeframe of the studies, as
I said, for a couple of years, and
553
:we've focused in that long-term study
on a particular model of anxiety.
554
:Which is a prenatal stress model.
555
:So the animals that we're taking out two
years with TMS do actually have altered
556
:behavior in things like, the elevated
plus maze where you measure anxiety.
557
:The amount of time that rodents spend
in open spaces indicates anxiety.
558
:And we're also looking at social
interaction in those animals.
559
:So how much time they spend with familiar
or novel, conspecifics, so animals, other
560
:mice that the mice have never met before.
561
:So we're, trying to build in a wider
range of behavioral tests that are
562
:more relevant to, mood disorders.
563
:and again, I think once we have a
better idea of what's happening over
564
:this two year period, we can then go
back in again and focus on expanding
565
:particular areas or focusing on
a particular time point as well.
566
:And the big question that
everybody asks us is, how about
567
:maintenance TMS maintenance?
568
:How are you going to give the mice
maintenance TMS at six months?
569
:Oh no, you've just added another
6,000 million mice to our experiment.
570
:It's just, there's only so much
that we can do, and there's
571
:so many questions to answer.
572
:Mike: Mm-hmm.
573
:Yeah.
574
:There must be a challenge to think
about in some ways how to balance
575
:the focusing on the safety with.
576
:Changes that might correlate with
effectiveness in human clinical models.
577
:Jenny: And I think that the
safety, the safety issue, we're
578
:really confident that TMS is safe.
579
:the changes in behavior that
we've identified were, we're
580
:hoping that we'll be able to show
that they spontaneously revert.
581
:if not, I think the sorts of
changes around integration in
582
:sensory motor brain function.
583
:We know that there are very good
physiotherapy type interventions
584
:that can act on those things.
585
:So if we do need to combine TMS with some
sort of rehabilitation therapy afterwards
586
:to make sure that those pathways are
restored, I think that's very feasible.
587
:'cause there's a good background
on those sorts of interventions.
588
:so the safety I think.
589
:we're confident that there's not
going to be any major problems.
590
:it's just making sure that the
efficacy is really targeted.
591
:I think that's one of the
big goals of the lab moment.
592
:Mike: Mm-hmm.
593
:So would you say that, that there's some,
there's some validity in the notion that
594
:then perhaps the less focused magnetic
field might be almost more akin to TDCS,
595
:where there's, there's perhaps more of a.
596
:Priming.
597
:So that, and concurrent kind of activity,
as you say with the physiotherapy
598
:or behavioral therapy or some sort
of active enrichment paradigm is, is
599
:gonna be where there's Yeah, there's
kind of a synergistic effect for, for,
600
:in like a positive therapeutic sense.
601
:Jenny: Yeah, that's a
really good question.
602
:And we've had the low intensity
TMS compared to TDCS or TACS.
603
:The transcranial, alternating current,
in a number of, conferences and
604
:discussions, reviews that we've had.
605
:So I think that's a
really interesting point.
606
:And, it comes back to how much, how
much do we actually need to stimulate
607
:the brain when we are delivering TMS
and, activating motor of potentials
608
:and triggering action potentials.
609
:Is that overkill?
610
:Are we actually.
611
:Activating the brain so much
that you then call up homeostatic
612
:mechanisms, might try and reverse that
plasticity because we've gone too far.
613
:So the low intensity stimulation from
that point of view of priming and
614
:raising the capacity of the brain to
respond in a more sensitive way to
615
:stimuli is a really tempting way to
look at those mechanisms, I think.
616
:And homeostatic plasticity
is, is very complicated.
617
:I don't think I really
understand it still.
618
:And we, it would be wonderful
to think of TMS as a primer.
619
:And we've done some work in
animal models where we deliver TMS
620
:concurrently with a learning paradigm,
concurrently with wheel running.
621
:So exercise.
622
:And, we also have delivered TMS to
the visual system in the dark so the
623
:animals aren't getting concurrent light
stimulation while they're getting the TMS.
624
:And they're really, I
think they're really.
625
:I'm very proud of that work.
626
:I think it's really, really
interesting work because by
627
:playing with the, endogenous brain
activity at the same time as you're
628
:delivering TMS, we could identify,
you can have too much activation,
629
:but you can also have too little.
630
:And it's that goldilocks bit where
you get the right amount of endogenous
631
:activity combined with the right
amount of TMS, in order to repair brain
632
:circuits in the best possible way.
633
:Mike: Yeah, that's fascinating.
634
:And so much of what we know about the
brain and, and how you know that the
635
:tried and true treatments work, it, it
does really reinforce this idea of just
636
:trying to restore homeostasis and balance.
637
:And so that makes total sense.
638
:Yeah.
639
:Just also trying to, just trying to
not interfere too much with, with
640
:what our body does naturally to try
and maintain its own equilibrium.
641
:Yeah, definitely.
642
:so I'm just curious, like as far as,
you've mentioned, you know, a few
643
:times, understandably, certain kinds of
limitations around things funding and
644
:that, and so I guess just in an imaginary
world, if you had unlimited funding and
645
:no barriers, what ambitious experiment do
you think you'd be interested in doing?
646
:Or, you know, what would be
something that you maybe would,
647
:would wanna try and pursue based on
what the, the lab has found so far?
648
:Jenny: Yeah, that's, that's
a really good question.
649
:And I love those open-ended questions.
650
:Wow, what would I do?
651
:And I'm actually the two year study,
the long-term lifespan study in, in mice
652
:that I've described a few times today.
653
:That was really my, my dream
experiment that I would do, and
654
:I'm very fortunate we received a,
a large grant to, to do that work.
655
:And it's, it's an exceptional
opportunity, I think, for us to answer
656
:that big question of, of the lifespan.
657
:It's, it's not a small undertaking,
but even, you know, bigger than
658
:that, it was, it was interesting.
659
:I was at, a conference at the end of last
year where we had a TMS symposium with
660
:researchers, from various labs in the us.
661
:They very kindly invited me
to, to join in that symposium.
662
:And the, the impression I took
away from that was that we're all
663
:doing very different experiments.
664
:So some people are using optogenetics
to trigger activation of neurons in the
665
:brain to study, particular frequencies.
666
:And other researchers have, done
similar to what we've done, miniaturize
667
:the coil, but managed to engineer it
in such a way that they get a much
668
:higher intensity, magnetic field.
669
:And they're, they're looking at
the processes involved in that.
670
:There are other groups that are using
electrical stimulation, so bypassing the
671
:magnetic field altogether in animal models
and, and activating neurons directly.
672
:And all of the talks were just so
fascinating because they addressed a
673
:particular question in so much detail that
they, they, nobody's solved any problems,
674
:but they're really increasing knowledge.
675
:And I think at the moment, what's
so exciting about the TMS field is
676
:that everybody's doing different
models and different approaches and.
677
:In a few years.
678
:I, I'm really hoping all
of that will come together.
679
:And the big experiment that I would
like to do almost is to regularly get
680
:these preclinical animal researchers
together and make sure that we're
681
:doing things in a way that we can
share that information across models.
682
:because it's, I think all of the
models have value you if you're
683
:asking a question there is.
684
:A model that will answer that particular
question in the best possible way.
685
:But we all have different questions,
so we're all using different models.
686
:But you know, it would be wonderful
to just put all of that together
687
:in a way that we could then make
sense of the bigger picture based
688
:on those individual puzzle pieces.
689
:it, I think the TMS field at
this point is, it's a bit wild.
690
:Everybody's doing their own thing, but.
691
:It will come together.
692
:And I think maintaining that communication
across labs and facilitating travel
693
:and exchange and collaboration will,
will really move the field forward.
694
:I don't have a big vision yet.
695
:I think that vision will emerge,
but I'd love to be part of
696
:bringing that vision together.
697
:Mike: Yeah.
698
:It, uh, makes, that makes perfect sense.
699
:And it makes me think that one of the
things you said earlier about how the
700
:evolution of TMS has almost kind of
gone backwards, where, you know, it was
701
:just sort of devised as the device, you
know, initially when 25 odd years ago,
702
:and then just trialed on people and then
the research has kind of gone backwards.
703
:Right.
704
:And so now I could, mm-hmm.
705
:That kind of time course makes sense
in terms of how then there's this
706
:sort of perhaps somewhat disorganized
kind of scattershot of approaches
707
:in terms of other technologies
or variations on theme of PMS.
708
:But you know, hopefully, I think the
more, obviously the more information
709
:that we have about these therapies,
these technologies, then the
710
:better we're better off we all are.
711
:We can just, the synthesis of it, I
think, as you say, is really important.
712
:Separating the wheat from the chaff,
I guess, and then figuring out how
713
:then to best apply that in clinical
terms to get people well as quickly
714
:as possible for as long as possible.
715
:Yep,
716
:Jenny: yep.
717
:I think also there's the temptation in
TMS to dive into that parameter space
718
:where you can test infinite numbers
of frequencies and pulses, and I don't
719
:think we have enough time to do that.
720
:Literally.
721
:I think it would take just
a ridiculous amount of time.
722
:So every so often we sit down in
the lab and discuss, how could we
723
:design an experiment or how could we
use, the tools like AI and modeling
724
:to work out what parameters are
the most likely to be effective.
725
:And I think that's more
strategic, thinking around what
726
:are the best experiments to do.
727
:it's important to do that from
a translational point of view.
728
:'cause it's so easy to
get lost in all of these.
729
:Very complicated parameters.
730
:And as you mentioned before, there are
a number of stimulation modalities.
731
:You've got the TDCS and TACS
ultrasound is becoming, is the
732
:latest, exciting, new, new tool.
733
:are we back again to this, device that's
going to start being used in, in people
734
:without having the research to back it up.
735
:So I think also there's cautionary
tales there moving forward, if
736
:we have got new technologies that
can stimulate the brand, let's.
737
:Maybe just take a step back and do some
of the basic safety and, and mechanisms
738
:so that we know what we're doing.
739
:Mike: Yeah.
740
:No, well congratulations to you and
your team for that because I think
741
:it's extremely important to just
guard against the, the potential for
742
:there to be excesses and people to be
perhaps, taking advantage of, if it's
743
:some, someone that's maybe un or maybe
just overly excited and developing.
744
:Are not necessarily regulated
or, or perhaps as evidence
745
:based as they should be.
746
:And then, so having research like yours
that is, is obviously solid and is just
747
:gonna add to the body of work that shows
that there is an evidence based, not only
748
:kind of clinical underpinning based on
population based studies, but the, the
749
:basic science is also aligned in terms
of the evidence, not only in terms of the
750
:effectiveness, but the safety, especially.
751
:Jenny: Thank you that that means
a lot to me and I'm sure my team
752
:will appreciate that as well.
753
:The other thing I, I want to mention is
that we publish a lot of negative results,
754
:and that I think is also really important.
755
:It's always a bit of a struggle to get
those results published and the students
756
:often who lead those studies often feel
a little bit disappointed, but it's
757
:really important to point out when things
don't work or don't have an effect.
758
:and I think that.
759
:Something that, again, we're really
proud of, of publishing as much negative
760
:results as we can when possible.
761
:Mike: Yeah, that's a
really important point.
762
:Maybe for listeners, like viewers
and listeners, can you just explain
763
:a little bit about what that means?
764
:Negative studies and maybe if you have
a couple of examples from your lab.
765
:Jenny: Yes.
766
:so I have plenty of examples.
767
:The, well, I suppose the, the
recent study, the adolescent
768
:mouse TMS study really.
769
:Initially we thought that that was going
to be a completely negative result study.
770
:So we, when we stimulated the mice
and didn't see any changes in the
771
:anatomy, didn't see any changes in
the cellular components, but only
772
:a very small behavioral change.
773
:Now that was essentially, most
of that study was negative.
774
:And what that tells us is that TMS is
probably not having massive effects
775
:on certain things, which in our
context was a good result in safety.
776
:We've had other, studies, for example,
where we've given stimulation during
777
:a, sorry, I'm thinking of the task.
778
:It's a, it's a lever pressing
task where you train, mice to
779
:press a lever to get a reward.
780
:And we thought that because.
781
:Generally TMS is thought to
increase dopamine levels and
782
:might affect the reward pathway.
783
:We thought, this is a great model
to look at so that we might be able
784
:to see that delivering TMS during
leaving lever presser might reinforce,
785
:those compulsive or addictive
behaviors or it might prevent them.
786
:And that was a study that was negative.
787
:so that allowed us to say, well,
in our models with our TMS, we're
788
:not going to waste any more time
looking at addiction or looking at.
789
:compulsive behaviors because
our particular tools don't work.
790
:It doesn't mean that, human TMS
doesn't work, but in our models we
791
:cannot use that to study addiction.
792
:mm-hmm.
793
:So those sorts of examples
I think are really useful.
794
:Mike: Yeah, definitely.
795
:No, again, congratulations.
796
:I think it's just, it's really
impressive and, you know, it's, it's,
797
:it's very exciting just in terms of,
I'm just sort of dipping my toe into
798
:understanding more and more about the
basic research, the animal models.
799
:And I think it's just endless
in terms of the potential and
800
:it's extremely interesting.
801
:well maybe before we wrap up, was
there anything else that you wanted
802
:to share about, you know, your,
your work, your lab's work and yeah.
803
:Anything that you thought
that might be important?
804
:Jenny: No, thank you very much.
805
:I just like to acknowledge that, you know,
I've spoken a lot about myself and as if
806
:it's my, my work, but, obviously it's,
it's, the work of many, many students.
807
:Very talented, honors and PhD and
master's students and postdocs
808
:in my lab over the years.
809
:And, also in, in research, people
bring their own interests to the
810
:team and it's really been through
students asking particular questions
811
:and their own interests that.
812
:We've gone off on little side tangents and
found some really interesting findings.
813
:So being in science is really
exciting and the opportunity to
814
:do these experiments and ask these
questions is a real privilege.
815
:thank you for letting me talk about it.
816
:Mike: Oh, that's great.
817
:Thank you so much for,
for talking to us today.
818
:I really appreciate it.
819
:And yeah, again, congratulations to you
and your colleagues, students, everyone
820
:think it's just a fantastic, fantastic,
projects that, that you spearheaded.
821
:And I think that hopefully we'll find
out more in the coming months and
822
:years about the upcoming results,
especially of the two year study.
823
:I think it's gonna be very
interesting to see how that goes.
824
:So myself posted on that.
825
:Jenny: Thank you.
826
:I'm excited as well.
827
:Mike: Okay.
828
:Well thanks again, Jenny.
829
:Really, really appreciate your time
and such an interesting conversation.
830
:So all the best and yeah, hopefully
maybe we'll bump into you at some
831
:point conference or, have another
podcast at some point in the future.
832
:Maybe we can plan to talk a bit about
the results of the, the long-term
833
:study, when those are available.
834
:Jenny: Love to, that would
be fantastic, Michael.
835
:Thank you.
836
:Mike: Okay.
837
:Yeah, thanks.
838
:So that brings us to the end of
today's conversation with Dr.
839
:Jenny Rodger.
840
:Her research offers crucial insights
into how low intensity rTMS interacts
841
:with the developing brain, and it really
reminds us of the importance of cautious
842
:evidence-based innovation as we expand
neurostimulation into younger populations.
843
:If you've enjoyed this episode,
please be sure to like and subscribe.
844
:Leave a review or ask questions in the
comment section below and share it with
845
:anyone that you think might be interested.
846
:I'm going to add links to Dr.
847
:Rodger's labs, information and
contacts and just, the relevant papers.
848
:I'll leave links to all of
that in the show notes below,
849
:so please do check those out.
850
:if you're interested in diving deeper
into this really important subject.
851
:Thanks again for your time, your
interest and your attention.
852
:I really appreciate, the fact that
you've watched or listened to the
853
:podcast and we'll see you next time
on The Neurostimulation Podcast.
854
:Thanks so much.