Jul 20, 2026 · 2h 41m
Dr. Tommy Wood outlines how physical and mental friction rewires the brain
Accelerate Learning & Increase Cognitive Capacity | Dr. Tommy Wood
Understanding how to actively trigger neuroplasticity through targeted exercise and cognitive challenges is essential for preventing age-related mental decline.
- 1True neuroplasticity is driven by the discomfort of making errors during novel, complex motor and cognitive challenges.
- 2Different exercise modalities target distinct brain structures, with resistance training aiding white matter and aerobic work supporting gray matter.
- 3Dementia risk can be significantly lowered by addressing modifiable factors like hearing loss, social isolation, and nutrient deficiencies.
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Dr. Tommy Wood explains the 'clutch state' in sports psychology, where effortful striving and performing under pressure drive cognitive adaptation.
The brief
Neuroscientist Dr. Tommy Wood joins the podcast to challenge conventional wisdom on brain health, explaining that true cognitive longevity requires pushing past comfortable routines and actively embracing difficult, complex physical and mental challenges.
While adult neurogenesis is largely a myth, Dr. Tommy Wood explains that neuroplasticity remains highly active through the restructuring of existing synapses. To trigger this rewiring, the brain requires the friction and discomfort of making mistakes.
Physical exercise acts as a direct lever for brain structure. Dr. Tommy Wood highlights how resistance training primarily supports the brain's white matter, while aerobic training, like high-intensity intervals, directly benefits gray matter.
Beyond movement, cognitive resilience is heavily influenced by modifiable lifestyle factors. Simple interventions, from managing hearing loss and social isolation to strategic supplementation with creatine and choline, help defend against dementia.
What was said on this episode
36 statements · 23 positive · 4 negative · 1 mixed · 8 neutral
Six months of HIIT improved hippocampal function more than Zone 2 and benefits persisted five years.
“that high intensity interval training group, they improved their fitness just as well as the Zone 2 group, interestingly, but they had much better improvements in hippocampal function and maintenance of hippocampal structure on an MRI scan. And they maintained that benefit for five years after the six month intervention.”
Listen at 0:31
Learning, interaction, and remembering engage neuroplasticity.
“every time you learn something, interact with something, remember something. The principles of neuroplasticity are engaged, right?”
Listen at 5:44
Adult brains can continuously change neural connections despite relatively fixed cell numbers.
“just because we have a fixed number, relatively fixed number of cells, doesn't mean that we can't change the connections between those cells. And that's happening all the time.”
Listen at 8:06
Novel cognitive activities improve function in older adults.
“by engaging older adults in novel cognitive activities, you see improvements in function”
Listen at 13:25
Novel cognitive interventions particularly improve executive function.
“you see in randomized controlled trials, improvements, particularly in executive function.”
Listen at 13:47
Processing-speed training with boosters reduced dementia risk two decades later.
“those who did processing speed training with booster sessions at one and three years had a significantly decreased risk of dementia 20 years later.”
Listen at 19:21
Crosswords and Sudoku provide less cognitive challenge and more meditative effects.
“crossword and sudoku, they're less of like a true cognitive challenge, right. It almost has more of like a meditation, meditative like effect.”
Listen at 23:34
Brain adaptations are broader when learning stimuli engage broader capabilities.
“the narrowness of the response or the breadth of the response is proportional to the narrowness or the breadth of the stimulus.”
Listen at 24:23
Meta-analyses find ballroom and line dancing produce the largest cognitive benefits in older adults.
“meta analyses of these interventions in older adults showing that ballroom and line dancing have the greatest effect on cognitive function.”
Listen at 28:11
Making mistakes is critical for driving neuroplasticity.
“it's so critical to driving those processes of neuroplasticity that we make those mistakes”
Listen at 31:55
Overcoming meaningful challenges builds perceived capability that transfers to other activities.
“you proved to yourself, hey, I'm capable, I'm able to overcome challenges. I'm able to, you know, engage and do difficult things. And I think the psychological benefits of that, you just. That process of engaging with a challenge, overcoming it, working hard to do that, I think that's just almost like a core psychological need that we have. And then that transfers to all these other things.”
Listen at 35:49
Flow is the maximal expression of a complex learned skill.
“I think of flow as the maximal expression of a complex learned skill.”
Listen at 38:18
People can perform optimally in effortful clutch states without experiencing flow.
“People can perform at the best of their abilities in clutch states.”
Listen at 39:52
Improving a skill requires working beyond current capacity, which disrupts flow.
“if you want to get better at that skill, you have to work even further beyond your current capacities, which will move you out of flow because of the friction, the mistakes and the errors that come from that.”
Listen at 40:44
Practice amount predicted piano-specific performance more strongly than age.
“the most important predictor of how well somebody performed at those piano specific skills was not their age, it was how much they practice.”
Listen at 50:06
Expert violinists typically practiced two daily sessions lasting 60–90 minutes.
“they tended to practice for about two sessions of 60 to 90 minutes a day.”
Listen at 53:15
Eliminating distractions is among the best ways to achieve deep focused work.
“one of the best ways to like truly get deep, focused work done is to eliminate distractions.”
Listen at 55:58
Reducing excessive energy intake can improve cognition.
“The most important thing, and I think this is where some of the benefits of caloric restriction happened in that trial compared to the mind diet, was that people's cognition improved just because they decreased their energy intake to a point that was more, was essentially what their brain needed”
Listen at 1:04:47
Over several days, omega-3 supplement forms produce similar brain availability.
“if you supplement over several days, it all kind of comes out in the wash.”
Listen at 1:11:22
B vitamins do not benefit cognition when elevated homocysteine coexists with poor omega-3 status.
“if you give B vitamins to somebody who has elevated homocysteine, you bring down their homocysteine, but they have poor omega 3 levels. You don't see any benefit.”
Listen at 1:14:36
A basic multivitamin produced modest cognitive improvements in older adults.
“those who got the multivitamin saw changes in cognitive function that suggested some improvements”
Listen at 1:16:03
The strongest evidence supports avoiding nutrient deficiencies rather than pursuing excess.
“The best evidence we have just says is in reality, don't be deficient.”
Listen at 1:22:52
Most non-GLP peptides lack human evidence for their intended effects.
“Most of those if not all of them except for the GLP ones don't, don't have that evidence. Or for the thing that you're trying to get.”
Listen at 1:29:51
Safety evidence should be established before trying injectable or orally consumed compounds.
“if you're going to consider injecting or taking something the first thing you should want to know is is this safe?”
Listen at 1:30:12
High-dose creatine appears well tolerated in frail older adults.
“At least we know that you can give high doses of creatine to frail older, older individuals with essentially no side effects.”
Listen at 1:31:37
Caffeine can improve perceived performance while worsening performance on some cognitive tasks.
“giving people caffeine makes them. Them feel like they're performing better, but they're actually performing worse on certain cognitive tasks.”
Listen at 1:35:38
Cannabis increases perceived creativity without improving objectively measured creativity.
“People taking cannabis felt like they were more creative, but actually they weren't.”
Listen at 1:36:41
A 20–30 minute jog has the strongest evidence for immediate cognitive benefits.
“the protocol that has like the best evidence for it is like a 20 to 30 minute jog.”
Listen at 1:41:20
In the cited HIIT study, greater effort and cortisol release predicted greater hippocampal benefits.
“the harder people work worked and the more cortisol they released, the better the benefit.”
Listen at 1:45:53
Chronic stress is associated with metabolic disease, inflammation, heart disease, and dementia.
“chronic stress, be they psychological, physical, increased allostatic load code increase, metabolic disease, inflammation, blood sugar dysregulation, insulin resistance, significantly associated with heart disease, dementia”
Listen at 1:51:13
Acute stress drives physiological adaptation.
“stress drives adaptation.”
Listen at 1:51:48
Approximately half of dementia cases may be preventable.
“potentially half of cases of dementia are preventable.”
Listen at 2:04:45
Preventing overheating is important after concussion.
“What seems to be important is preventing hyperthermia.”
Listen at 2:20:44
Avoid alcohol and caffeine after concussion to support sleep and recovery.
“So avoid alcohol, avoid caffeine, both of those potentially related to improving sleep.”
Listen at 2:22:38
A pediatric concussion trial administered creatine at 0.4 grams per kilogram daily.
“they gave 0.4 grams per kilo per day.”
Listen at 2:23:00
Gradual return to physical activity soon after concussion is important, avoiding another head injury.
“return to physical activity as soon as possible is really important without getting another head injury.”
Listen at 2:29:51
Statements are attributed to the speaker as said on the episode and reflect their view at the time, not PodLume's. They are not advice.
