Accelerate Learning & Increase Cognitive Capacity | Dr. Tommy Wood
Dr. Tommy Wood discusses neuroplasticity, exercise's role in brain health, cognitive training, and nutrition for dementia prevention. He emphasizes that different forms of exercise (aerobic vs. resistance training) target different brain structures, and introduces the concept of "clutch states" as optimal for learning and performance.
Summary
This extensive conversation between Andrew Huberman and Dr. Tommy Wood covers multiple dimensions of brain health and neuroplasticity. Wood begins by clarifying that neuroplasticity—the brain's ability to change connections between neurons—is fundamentally different from neurogenesis (creating new neurons). He explains that adults maintain relatively fixed neuron numbers, but synaptic connections continuously strengthen, weaken, or prune based on experience and learning demands.
The discussion emphasizes that learning requires exposure to novel, challenging activities outside one's current skill set. Wood argues that maintaining cognitive function requires both continuing familiar cognitively-engaging activities and regularly taking on entirely new challenges. He references large-scale intervention trials (FINGER, POINTER, Maintain Your Brain) showing that cognitive training, physical activity, diet, and cardiovascular risk factor management collectively reduce dementia risk.
A central theme is the distinction between "flow states" and "clutch states." While flow represents the seamless expression of mastered skills, clutch states describe peak performance under pressure that still feels like hard work. Wood argues that optimal learning and performance often occur in clutch states, not flow, and that people mistakenly chase flow when they should embrace the cognitive friction of clutch performance.
On exercise, Wood presents compelling evidence that different modalities affect different brain structures: aerobic exercise (zone 2 intensity or high-intensity interval training like the Norwegian 4x4 protocol) enhances hippocampal function and gray matter, while resistance training benefits white matter structure and executive function through IGF-1 signaling. A six-month study showed high-intensity interval training produced better hippocampal improvements than steady-state aerobic work, with benefits persisting five years later. The key stimulus appears to be lactate release and associated molecular cascades, not simply increased arousal.
On nutrition, Wood explains that while whole foods remain foundational, supplement efficacy depends on baseline nutrient status. He emphasizes testing blood levels (vitamin D, omega-3 index, homocysteine, B vitamins) rather than blanket supplementation. Critically, he notes that omega-3s and B vitamins interact—trials supplementing only one without addressing the other show no benefit. The Mediterranean/MIND diet pattern shows consistent associations with lower dementia risk, though the specific mechanism appears to be overall nutrient density rather than any single component.
Regarding dementia prevention, Wood cites the Lancet Commission's identification of 14 modifiable risk factors accounting for ~45% of dementia cases (potentially up to 70% with broader social factors included). The neurotropic hypothesis linking herpes viruses to Alzheimer's receives support from natural experiments showing shingles vaccination reduces dementia risk, particularly in women, though randomized trials are still needed. Wood emphasizes that major illnesses cause stepwise cognitive decline that standard interventions may not fully reverse.
For concussion recovery, Wood provides specific supplementation protocols: creatine (0.4 g/kg/day in loading phase), magnesium (400mg daily), omega-3s (for long-term protection), and symptom-specific interventions like branched-chain amino acids for sleep issues. Temperature regulation, blood sugar control, and avoiding alcohol and excess caffeine feature prominently. Early return to graded physical activity—not rest—appears critical for recovery.
The conversation touches on supplements and peptides, with Wood advocating for evidence-based approaches. He notes that stimulants (caffeine, methylphenidate) create dissociations between subjective performance feelings and actual cognitive outcomes, making endogenous arousal via exercise more reliable. On emerging peptides, he emphasizes the need for documented safety data and specific target problems before use.
Wood also discusses his personal athletic pursuits—competing as a natural (drug-tested) lightweight strongman in the master's category, highlighting that continuous physical challenge across the lifespan aligns with neuroplasticity principles.
About this episode
Dr. Tommy Wood, BM, BCh, PhD, is a professor of neuroscience at the University of Washington and an expert on brain health, neuroplasticity, and cognitive performance. Dr. Wood explains how to use specific forms of exercise, dietary strategies, and compounds to enhance the rate and stability of mental and/or physical skill development. We also discuss science-based tools to preserve cognitive function, reduce dementia risk, and offset loss of memory after a concussion or other brain injury. This episode provides practical, science-based tools for learning new information and skills and for improving your overall ability to learn. Read the episode show notes at hubermanlab.com. Thank you to our sponsors AG1: https://drinkag1.com/huberman David: https://davidprotein.com/huberman Function: https://functionhealth.com/huberman Rorra: https://rorra.com/huberman Timestamps (00:00:00) Tommy Wood (00:04:05) Neuroplasticity; Neurogenesis; Synaptic Pruning (00:11:11) Aging & Neuroplasticity; Familiar vs Novel Tasks (00:14:33) Protocols Book; Sponsor: David (00:16:49) Aging, Training & Processing Speed (00:21:56) Enhancing Neuroplasticity with Age, Tool: Motor & Cognitive Challenge (00:26:56) Learning New Skills, Dance, Sports, Arts; Psychological Benefits of Challenge (00:36:50) Flow, Clutch States; Virtuosity (00:46:59) Power of Practice (00:50:55) Sponsor: AG1 (00:52:14) Tools for Focused Work & Learning; Distractions (01:00:17) Nutrition for Brain Health, Dementia; Critical Nutrients (01:06:56) Nutrient Timing, Supplementation; Omega-3s, Tool: Blood Tests (01:16:41) Sponsor: Function (01:18:19) Enhancing Brain Health, Nutrition & Supplements (01:23:10) GLP-1s, Peptides, Supplements & Evaluating Efficacy (01:32:56) Stimulants: Feeling vs Performance (01:37:18) Exercise & Enhancing Cognitive Function, Tool: Optimize Exercise Volume (01:43:18) Long-Term Cognitive Health & Exercise, HIIT (01:47:17) Sponsor: Rorra (01:48:31) Cortisol Benefits, Acute vs Chronic Stress (01:54:24) Resistance & Aerobic Exercise, Brain Gray & White Matter, Cognitive Health (02:03:37) Cognitive Decline, Dementia, Alzheimer's Disease, Modifiable Risk Factors (02:09:47) Shingles Vaccine & Dementia Risk; Tool: Avoid Illness for Cognitive Health (02:18:28) Concussion, Traumatic Brain Injury (TBI), Creatine (02:24:04) Treating TBI, Supplements, Physical Therapy (02:32:16) Strongman Competition (02:38:51) Zero-Cost Support, YouTube, Spotify & Apple Follow, Reviews & Feedback, Sponsors, Protocols Book, Social Media, Neural Network Newsletter Disclaimer & Disclosures Learn more about your ad choices. Visit megaphone.fm/adchoices
Key Insights
- Adults maintain a relatively fixed number of neurons after early childhood, so brain plasticity depends on changing connections between existing neurons rather than generating new ones, making the focus on neurogenesis in popular science somewhat misleading
- Pruning and removal of synaptic connections is as critical to learning and development as strengthening new connections, particularly for refining motor skills and eliminating inefficient neural patterns
- Learning and optimal cognitive function require both continuing familiar cognitively-engaging activities AND regularly taking on entirely new, challenging activities outside one's current skill set to maintain broad cognitive capacity
- Processing speed decline in aging is distinct from reaction time decline—processing speed remains stable until about age 60 then drops, making training to process information quickly under time constraints a promising intervention for older adults
- Flow states represent the seamless expression of mastered skills and are one valid brain state for performance, but clutch states—where peak performance occurs under pressure despite high cognitive effort—are equally important and often overlooked in popular discussion
- High-intensity interval training (Norwegian 4x4 protocol: 4 minutes at 85-95% max heart rate, repeated 4 times) produces superior hippocampal structural improvements and function compared to equivalent steady-state aerobic work, with benefits persisting 5 years post-intervention
- Aerobic exercise primarily improves gray matter (including hippocampus) through lactate signaling and BDNF production, while resistance training primarily improves white matter structure through IGF-1 signaling, requiring both exercise types for comprehensive brain benefits
- Caffeine and other stimulants create a dissociation where users feel they're performing better while objectively making more errors on complex cognitive tasks, unlike endogenous arousal increases from exercise which align subjective and objective performance improvements
- Supplement efficacy depends critically on baseline nutrient status—trials showing no benefit from omega-3s or B vitamins were often conducted on populations not deficient in those nutrients, and omega-3 and B vitamin status interact such that supplementing only one without addressing the other shows no cognitive benefit
- The Mediterranean diet's association with lower dementia risk appears driven by overall nutrient density rather than any specific component (olive oil, fish, etc.), as removing individual foods or components doesn't eliminate the protective association
- Herpes viruses (including varicella-zoster virus causing shingles) establish latent infections in neurons, and shingles vaccination shows consistent associations with reduced dementia risk 20 years later across multiple natural experiments in UK, Australia, and Canada, though causation remains unproven
- Cognitive function decline in aging follows a stepwise pattern rather than linear decline, with major illness episodes causing sharp drops in function that standard interventions may not fully recover, supporting illness prevention as critical for maintaining cognitive trajectory
- Immediately after concussion, the primary concern is preventing hyperthermia (excessive heat) because brain injury creates an energy deficit where increased metabolic demands from heat exposure or stimulation exceed energy production capacity, triggering cell death and neuroinflammation
- Chronic stress differs fundamentally from acute stress in that chronically elevated cortisol without recovery opportunity drives adaptation failure and increases allostatic load, but acute stress and the associated cortisol release are essential drivers of physiological adaptation including neuroplasticity
- Resistance training with proper recovery produces step-wise white matter improvements (a leading predictor of cognitive decline) in 6-12 months through IGF-1 signaling, benefiting executive function and processing speed more specifically than aerobic exercise
Topics
Transcript
There's a much more recent study that took again older adults and randomized them across three different groups. One was like a low intensity group. Another group basically did kind of zone two type work on a treadmill three times a week. And the third group did a high intensity interval training intervention, which is the Norwegian four by four protocol. So four minutes, 85 to 95 percent of maximum heart rate. They had a three minute rest in their protocol. They did that four times over. That's three times a week, three times a week for six months. That's, that's pretty intense. But what they showed was that that high intensity interval training group, they improved their fitness just…
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