Accelerate Learning & Increase Cognitive Capacity | Dr. Tommy Wood

What It Covers

Neuroscientist and medical doctor Tommy Wood joins Andrew Huberman to detail how specific exercise types, brain states, nutrition, and supplementation protocols each open distinct windows for neuroplasticity. The conversation covers clutch states versus flow states, optimal learning session structure, the Norwegian 4x4 HIIT protocol's five-year hippocampal benefits, and nutrient interactions that predict or prevent cognitive decline across the lifespan.

Key Questions Answered

• •HIIT for Hippocampal Preservation: The Norwegian 4x4 protocol — four minutes at 85–95% max heart rate, three-minute rest, repeated four times, three sessions per week — outperforms zone-two cardio for hippocampal structure and function in older adults. A six-month intervention produced measurable MRI improvements that persisted for five full years afterward, suggesting brief high-intensity work creates durable structural brain changes that far outlast the training period itself.
• •Clutch State Over Flow State: Flow — performing a skill at its maximal expression — is not required for peak performance or learning. The clutch state, a sports psychology term, describes performing well under hard cognitive and physical effort without ease. Seeking the clutch state is more practical and more conducive to neuroplasticity than chasing flow, because real learning requires friction, errors, and discomfort that flow states actively exclude.
• •Processing Speed Training Reduces Dementia Risk: The ACTIVE trial found that visual processing speed training — identifying briefly flashed stimuli in shrinking time windows — with booster sessions at one and three years produced a statistically significant reduction in dementia risk measured twenty years later. This type of training improves cholinergic signaling across the brain, the same system degraded in Alzheimer's disease, and processing speed begins declining around age 60 without deliberate practice.
• •Broad Skill Learning Beats Narrow Brain Training: Digital brain training platforms produce gains only on the specific trained task with minimal transfer. Ballroom or line dancing, martial arts like Brazilian Jiu-Jitsu, and ball sports simultaneously engage motor learning, social interaction, auditory processing speed, and executive function. Meta-analyses of older adult interventions show these multi-domain activities produce the largest and most transferable cognitive improvements, because the breadth of the neural response matches the breadth of the stimulus.
• •Omega-3 and B-Vitamin Interaction Determines Efficacy: Three randomized controlled trials — VitaCog, B-Proof, and the Omega-AD trial — demonstrate that omega-3 fatty acids and homocysteine-lowering B vitamins are mutually dependent. Supplementing B vitamins without adequate omega-3 status produces no cognitive benefit, and omega-3 supplementation fails when homocysteine is elevated above roughly 10–11 µmol/L. Testing both omega-3 index and homocysteine levels before supplementing is the only reliable way to determine whether either intervention will work.
• •Optimal Learning Session Structure: Expert violinists in Ericsson's studies practiced in two sessions of 60–90 minutes per day, which aligns with the brain's capacity for sustained focused cognitive work. Deep learning requires unbroken attention in 20–30 minute chunks with short breaks. Eliminating all notifications and removing phones from the room is necessary because the brain becomes entrained to interruption patterns and will self-distract even when no external stimulus arrives, actively degrading learning quality.
• •Energy Availability Follows a Bell Curve for Brain Volume: Data comparing Bolivian Tsimane hunter-gatherers, an intermediate group, and industrialized populations show brain volume peaks at moderate caloric availability and declines at both extremes. Chronic caloric restriction shrinks the brain from resource scarcity; chronic caloric excess shrinks it through metabolic disease, inflammation, and elevated blood pressure. Correcting energy intake toward an appropriate range — before adding any specific nutrient or supplement — produces the largest baseline improvement in cognitive function.