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STEM-Talk

STEM-Talk

By: Dawn Kernagis and Ken Ford
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The most interesting people in the world of science and technologyFlorida Institute for Human and Machine Cognition Alternative & Complementary Medicine Hygiene & Healthy Living Natural History Nature & Ecology Science
Episodes
  • Episode 193: Tommy Wood and his new book bust the belief that the adult brain is fixed

    Episode 193: Tommy Wood and his new book bust the belief that the adult brain is fixed
    Mar 23 2026
    Today we have Dr. Tommy Wood, a neuroscientist and frequent STEM-Talk guest who joins today on the eve of the publication of his first book, “The Stimulated Mind: Future-Proof Your Brain from Dementia and Stay Sharp at Any Age.” Tommy is an Associate Professor of Pediatrics and Neuroscience at the University of Washington, where his laboratory focuses on brain health across human lifespan. Tommy is a colleague and good friend who also is a Visiting Research Scientist here at IHMC. Today we talk to Tommy about his mission to dispel the myth that the brain is doomed to decline with age. His book, which publishes on March 24 but is available for pre-order on Amazon, offers science-backed strategies to enhance mental sharpness and prevent cognitive decline, including Alzheimer’s disease. There was so much to unpack with Tommy about his book, that we decided to split his interview into two parts. Today we talk to Tommy about the history of neuroscience and how researchers go about studying the brain. We also have a conversation with Tommy about what is holding us back in terms of addressing an ever-increasing burden of cognitive and mental health disorders we are experiencing not only here in the U.S., but also around the world. In part two of Tommy’ interview, which will air in a few weeks following today’s episode, Tommy shares science-backed strategies to help people future-proof their brains. Tommy’s lab at the University of Washington focuses on brain health across the lifespan. He conducts research that focuses on ways to treat a range of brain injuries, including babies born preterm and adults who experience brain trauma. He also investigates lifestyle factors that affect long-term cognitive function and increase the risk of dementia. Tommy has a bachelor’s degree in biochemistry from the University of Cambridge, a medical degree from the University of Oxford, and a Ph.D. in Physiology and Neuroscience from the University of Oslo. Show notes: [00:04:04] Dawn opens our interview congratulating Tommy on his new book, “The Stimulated Mind.” Dawn asks Tommy what inspired him to write his first book. [00:07:29] Since writing the book consumed more than 18 months of Tommy’s life, Dawn asks Tommy if he thinks he’ll write another one. [00:09:36] Dawn asks if it’s fair to say that the overarching theme of “The Stimulated Mind” is that the conventional belief the adult brain is fixed and incapable of change is wrong. [00:17:35] Ken explains that Tommy opens his book with a story about a study on barn owls, where researchers outfitted a group of owls with prism goggles that altered the perceived position of objects in the owls’ vision. While young owls were able to quickly adapt to the change in their vision and return to normal behavior and activities, adult owls, even after months of wearing the goggles, were unable to adapt and would miss mice that were directly under their beaks. However, the research group amended their study design and found something interesting. Ken asks Tommy to explain what they found when they amended their design. [00:22:40] Ken asks Tommy to share how a human study, which outfitted participants with goggles that flipped their vision upside down, demonstrated the adaptability of the adult brain. [00:25:32] Ken asks if these sorts of adaptations have been seen as beyond basic sensory modalities in higher cognitive functions. [00:31:25] Dawn zooms out in our discussion and asks Tommy, given the falsehood of our previous understanding of the adult brain as being fixed, what exactly do we know about the brain. [00:35:36] Dawn asks Tommy to talk about Santiago Ramón y Cajal, who is considered the first neuroscientist. [00:38:41] Dawn mentions chapter two of Tommy’s book, “How do Neuroscientists Study the Brain,” in which Tommy explains the complexity of the brain, which is comprised of almost 100 billion neurons which compose nearly a quadrillion synapses. Given the complexity of the brain, Tommy notes in his book that even an organ as complex as the human brain is incapable of fully comprehending its own complexity. Dawn asks Tommy to talk about how he and his colleagues approach studying the brain. [00:43:30] Ken notes the parallels between attempting to understand the function of the brain based on an understanding of its individual components to the process of trying to understand how a piece of software works on a computer by systematically studying the computer’s hardware. Ken goes on to start a discussion on the parallels between the brain as a self-referential system that is so complex it cannot even fully understand itself, to various paradoxes as well as Gödel’s theorem, while noting that such comparisons are a false equivalency, and the brain is not a formal system in the sense of mathematical proofs. Still, Ken notes, the parallels are interesting. [00:47:07] Dawn asks Tommy about a humorous but insightful section in his book that ...
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    1 hr and 28 mins
  • Episode 192: Ken and Dawn weigh in on ChatGPT, ketamine, urolithin-A, rapamycin, and more in wide-ranging AMA

    Episode 192: Ken and Dawn weigh in on ChatGPT, ketamine, urolithin-A, rapamycin, and more in wide-ranging AMA
    Mar 5 2026
    ChatGPT has been in the news a lot lately and, as a result, quite a few STEM-Talk listeners have tossed us questions about the reliability and limitations of generative-artificial intelligence chatbots as well as large-language models more broadly. Ken and Dawn tackle this question and a number of others in today’s Ask Me Anything episode. We have listeners wondering why astronauts train in underwater conditions for spacewalks; icebreakers in antarctica; the value of supplementing with urolithin-A; and the effectiveness of L-citrulline in helping aging blood vessels. Ken also weights in on questions related to lithium deficiency and the onset of Alzheimer’s disease; a study that found mTOR activation may not be necessary for ketamine’s beneficial effects in the context of depression; and a paper that demonstrated short-term mTOR inhibition by rapamycin improved cardiac and endothelial function in older men. Show notes: [00:02:49] Ken opens our AMA with a listener question for Dawn, which asks why, despite the differences between diving and zero-gravity environments, why do astronauts train in underwater conditions for spacewalks. The listener goes on to mention an article they read about NASA’s neutral buoyancy lab in Houston, which contains a partial replica of the International Space Station. [00:07:42] A listener asks Ken if he is still optimistic about the value of supplementing with urolithin-A, and if so, is there a brand he recommends. Ken mentions episodes 118, with Julie Anderson, and 173, with Anurag Singh. Ken also discusses a paper titled “Effect of the mitophagy inducer urolithin A on age related immune decline, a randomized placebo-controlled trial” co-authored by Anurag. Ken also mentions clinical research supporting the urolithin-A supplement Mitopure. [00:10:53] A listener asks Ken about a paper titled “Short-term mTOR inhibition by rapamycin improves cardiac and endothelial function in older men: a proof-of-concept pilot study.” [00:14:29] Ken discusses a 2020 paper from a research group at Yale, which suggested that mTOR activation may not be necessary for ketamine’s beneficial effects in the context of depression. The paper also reported that m-TOR suppression via rapamycin might prolong ketamine’s antidepressant effects. [00:18:47] A research scientist formerly working in Antarctica asks Ken about Russia’s dominance in the realm of ice breakers. [00:23:55] A listener mentions that for some people, when they used ChatGPT to ask about the assassination of political commentator Charlie Kirk, ChatGPT sometimes responded by denying the assassination occurred. The listener asks Ken about the credibility and reliability of generative AI and large-language models. [00:28:49] Several listeners have submitted questions for Ken regarding a paper published in Nature in August of last year titled “Lithium deficiency in the onset of Alzheimer’s disease.” Ken gives his thoughts on this paper. [00:31:56] For our final question this AMA, a listener asks Ken about the arginine paradox, which regards L-arginine, which is used by the body to make nitric oxide, which is necessary to relax and maintain flexibility of blood vessels. However, several papers have reported that supplementation of arginine does not reliably improve aging blood vessels. In contrast, recent research suggests that L-citrulline might be more effective. The listeners sent questions asking about the possible effects of citrulline in vascular health and aging. In his answer, Ken cites the following papers: — Administration of L-arginine plus L-citrulline or L-citrulline alone successfully retarded endothelial senescence. — Effects of L-Citrulline Supplementation on Endothelial Function, Arterial Stiffness, and Blood Glucose Level in the Fasted and Acute Hyperglycemic States in Middle-Aged and Older Adults with Type 2 Diabetes. — Citrulline Supplementation Improves Microvascular Function and Muscle Strength in Middle-Aged and Older Adults with Type 2 Diabetes. — Effects of L-citrulline supplementation and watermelon intake on arterial stiffness and endothelial function in middle-aged and older adults: a systematic review and meta-analysis of randomized controlled trials. — Citrulline regulates macrophage metabolism and inflammation to counter aging in mice. If you have questions for Ken and Dawn after listening to today’s episode or any episode of STEM-Talk, please email our producer, Randy Hammer, at rhammer@ihmc.org. Links: Learn more about IHMC STEM-Talk homepage Ken Ford bio Ken Ford Wikipedia page Dawn Kernagis bio
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    40 mins
  • Episode 191: Francisco Gonzalez-Lima discusses methylene blue & noninvasive human brain stimulation

    Episode 191: Francisco Gonzalez-Lima discusses methylene blue & noninvasive human brain stimulation
    Feb 2 2026
    Today we have Dr. Francisco Gonzalez-Lima, a behavioral neuroscientist who was our guest in episodes 106 and 107 back in 2020. Since those 2020 interviews, Francisco and his colleagues at the Gonzalez-Lima Lab have produced dozens of more studies and papers that have advanced their work on methylene blue, transcranial lasers, memory enhancement, neuroprotection and neurocognitive disorders. Francisco and his lab at the University of Texas Austin are recognized as world leaders for their research on the relationships between brain energy metabolism, memory and neurobehavioral disorders. In today’s interview, we talk to Francisco about his lab’s most recent research on the beneficial neurocognitive and emotional effects of noninvasive human brain stimulation in healthy, aging and mentally ill populations. This research primarily uses transcranial infrared laser stimulation and multimodal imaging, which we will discuss in today’s interview. Be sure to check out our earlier interviews with Francisco where he talked aobut his work on brain metabolic mapping and Alzheimer’s, episode 106, and his research into methylene blue and near-infrared light as therapies for cognitive disorders, episode 107. Show notes: [00:04:32] Dawn and Ken open our interview with Francisco by mentioning that his lab has been very productive pursuing new research avenues since he was last on STEM-Talk. Ken mentions that Francisco has recently begun collaborating with his sister who has a PhD in computational and applied mathematics and asks Francisco to talk about the work they’re doing together. [00:06:21] Dawn shifts to talk about the roadblocks that Francisco and his team have been dealing with, particularly that the review process for academic papers is unusually slow, not just for Francisco’s team but at large. Dawn asks Francisco to discuss this issue. [00:10:37] Dawn recaps that in our previous interview with Francisco in 2020, the discussion focused on his research into methylene blue, which has been primarily used to treat methemoglobinemia, however, the potential for methylene blue to treat declining cognitive function is an active area of research. Despite Francisco’s successful work with methylene blue, he often gets asked about its safety, largely due to various misconceptions. Dawn asks Francisco to talk about the misconceptions about methylene blue. [00:14:57] Ken asks if Francisco what some other misconceptions about methylene blue are. [00:20:43] Given the discussion of dosing, Ken asks Francisco what the safe dose range is for methylene blue in humans. [00:28:15] Ken mentions an article published a few months ago titled “Beyond plaques: How methylene blue and ketones address vascular hypometabolism in Alzheimer’s disease” Ken goes on to mention that the article did a good job of summarizing Francisco’s work as well as the work of Steve Cunnane, who was our guest on episode 59. Ken asks Francisco to discuss his thoughts on the article. [00:34:25] Dawn shifts focus to discuss Francisco’s work on photobiomodulation, specifically transcranial infrared laser stimulation, which is a non-invasive method for neuroprotection and cognitive enhancement. Dawn explains that Francisco has written two chapters on this topic that summarizes his work in the area, one of which appeared in the Oxford handbook on transcranial stimulation, and the other is in a book on augmentation of brain function, based on a series of presentations he gave in Switzerland. Dawn asks Francisco to give a broad overview of his work on photobiomodulation and transcranial infrared laser stimulation. [00:43:52] Ken asks Francisco to talk about a paper titled “Light buckets and laser beams” that he and other researchers composed after attending a photobiomodulation workshop convened in 2023 by the director of the National Institute on Aging and several NIH lab directors. [00:51:25] Ken asks Francisco if there are any commercially available photobiomodulation devices that he thinks have substantial utility. [00:56:27] Ken asks Francisco to discuss mitochondrial disfunction in the context of neurodegeneration and his work on targeted stimulation of the mitochondria with photo biomodulation. [01:06:58] Ken asks Francisco to talk about the potential benefits of photobiomodulation on the aging process outside of neurodegenerative conditions. [01:17:16] Dawn mentions that transcranial infrared stimulation stimulates prefrontal energy metabolism and oxygenation, which produces cognitive enhancing effects. Dawn goes on to ask Francisco about his recent paper exploring this phenomenon in the context of depression titled “Augmenting internet based cognitive behavioral therapy for major depressive disorder with transcranial infrared laser stimulation.” [01:23:08] In light of the promising results of this study, Ken asks Francisco what he sees as the next research step to further this progress. [01:30:15] Ken comments on how Francisco ...
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    1 hr and 45 mins
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