How to Improve Memory: 10 Episodes That Explain What Works

How to improve memory, distilled from the podcast episodes we summarized: retrieval practice, post-learning adrenaline, exercise, and sleep, ranked with takeaways and quotes from Alan Castel, Wendy Suzuki, David Eagleman, and Jim Kwik.

The fastest way to improve memory is to stop rereading and start retrieving. Across every neuroscience episode in our library, one finding repeats: the effort of pulling information out of your own head, struggling, guessing wrong, then checking, builds a far stronger memory than any amount of passive review. Everything else on this page (exercise, sleep, adrenaline timing, attention) works by making that retrieval effort land harder and last longer.

This guide ranks the ten episodes in our summary library that explain the mechanics best. Six come from Huberman Lab, with the rest from Diary of a CEO, The Ed Mylett Show, and Modern Wisdom, and the set is weighted toward the past year of our summaries. Each entry below gives the editorial case for its rank, the specific takeaways worth acting on, and a quote that captures the conversation. Every summary links to our full episode breakdown, free to read.

One pattern is worth seeing before you start. These episodes sort into three layers that operate on different timescales: encoding (how information gets in, through retrieval practice, questions, and deliberate attention), consolidation (what locks it down afterward, through sleep, rest, and a well-timed adrenaline spike), and capacity (what raises your ceiling over decades, through aerobic exercise, novelty, and social challenge). We unpack those threads after the list.

1. How to Improve Your Memory and Cognitive Function at Any Age: Dr. Alan Castel

Huberman Lab · Andrew Huberman with Dr. Alan Castel · 2h 28m

The single best starting point, because Castel spends two and a half hours dismantling the intuition that repetition equals memory. His Apple logo demonstration is the proof: you have seen that logo thousands of times and still struggle to draw it accurately, which shows that exposure and encoding are separate processes. What he offers in exchange is errorful retrieval, a method you can run on anything you are trying to learn today.

Key takeaways

  • Errorful retrieval beats rereading: try to recall material cold, guess wrong, then check. The failed attempt is what builds the durable trace.
  • Exposure and memory are separate systems. Thousands of viewings of the Apple logo leave most people unsure where the bite sits, because seeing something differs from noticing it.
  • Consciously marking a moment as worth remembering strengthens encoding more than emotional intensity alone does.
  • Routine dulls memory through habituation. Change your route, your seat, or your usual order to restore the novelty that drives encoding.
  • Semantic depth outlasts mnemonics. Castel memorized the periodic table and later realized he understood no chemistry; learn how things interact to make knowledge durable.
Good learning happens through making mistakes. Just seeing something many times doesn't mean you'll remember it well. You've seen the Apple logo so many times, of course, you know all the features, but then when you quiz people and test them, and I do this in my class, people aren't sure. Is the bite on the left or the right hand side? Is there a stem or a leaf? — Dr. Alan Castel

Read the full episode summary

2. Understand and Improve Memory Using Science-Based Tools: Huberman Lab Essentials

Huberman Lab · Andrew Huberman · 35m

Thirty-five minutes that reverse the most common study habit on earth. Most people take caffeine before they study; the McGaugh and Cahill research Huberman walks through shows the memory gain comes from an adrenaline spike immediately after learning, when consolidation is starting. Cold exposure, a hard interval, or caffeine in the ten minutes following a study block reduces the repetitions you need. It is the highest leverage timing change on this page.

Key takeaways

  • Spike adrenaline right after learning, through cold exposure, intense exercise, or caffeine, to cut the repetitions required for retention.
  • What matters is the relative jump in adrenaline compared with your baseline just before, so a calm study block followed by a sharp spike works best.
  • Cardiovascular exercise releases osteocalcin from your bones, which reaches the hippocampus and improves its capacity to form new memories.
  • Deliberate mental snapshots, framing and choosing a scene to capture, encode visual memory more strongly than passive watching.
  • Acute stress sharpens learning while chronic elevation of cortisol and epinephrine degrades it, so keep the spikes brief.
It is the presence of high adrenaline, high amounts of norepinephrine and epinephrine that allows a memory to be stamped down quickly and far and away different than the idea that we remember things because they're important to us or because they evoke emotion. — Andrew Huberman

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3. Essentials: Tools to Boost Attention and Memory: Dr. Wendy Suzuki

Huberman Lab · Andrew Huberman with Dr. Wendy Suzuki · 36m

Suzuki turns exercise from general health advice into a memory protocol with doses and timing attached. A single 30 to 45 minute cardio session lifts attention and memory for roughly two hours, which tells you exactly when to schedule demanding cognitive work. Her forty-year Swedish cohort data, where highly fit women in their forties gained nine additional years of good cognition, is the strongest long-horizon number in this whole set.

Key takeaways

  • Four mechanisms make memories stick: novelty, repetition, association with what you already know, and emotional resonance.
  • One 30 to 45 minute cardio session boosts mood, attention, and memory for up to two hours, so train right before your hardest thinking.
  • Exercise releases dopamine, serotonin, noradrenaline, and BDNF, which grows new cells in the hippocampus over time.
  • Benefits are dose dependent up to about seven sessions a week: more frequency produced better mood and better hippocampal memory.
  • Ten minutes of walking is enough to shift mood, while 30 to 45 minutes is the threshold for measurable memory gains.
Every single time you move your body, it's like giving your brain this wonderful bubble bath of neurochemicals. — Dr. Wendy Suzuki

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4. Science and Tools of Learning and Memory: Dr. David Eagleman

Huberman Lab · Andrew Huberman with Dr. David Eagleman · 2h 24m

Eagleman supplies the operating principle behind every tactic on this list: your brain rewires only in proportion to how much it is challenged. His answer to the retiree doing daily crosswords is the clearest rule anyone states here, which is to quit an activity once you get good at it and find the next thing that makes you clumsy. He also explains why practice eventually reduces brain activity, moving skills from software into hardware.

Key takeaways

  • Seek novelty as the governing rule. Stay in the zone Eagleman calls frustrating but achievable, and move on once a challenge gets easy.
  • Repeated practice migrates a skill from effortful software to efficient hardware, which is why experts use less brain activity than amateurs.
  • Plasticity requires the right neurochemical cocktail, and curiosity is what reliably produces it, so learn things at the moment you want the answer.
  • The cortex runs one algorithm and specializes according to whatever you plug into it, which is why blind readers repurpose visual cortex for touch and hearing.
  • Nuns with Alzheimer's pathology stayed cognitively sharp while socially and intellectually engaged, evidence that use protects function even as tissue degrades.
Two words, seek novelty. That's the whole game is you got to continually challenge the brain. And this is something that as we get older is more important than ever. — Dr. David Eagleman

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5. 4 Brain Types That Unlock Your Memory Potential: Jim Kwik

The Ed Mylett Show · Ed Mylett with Jim Kwik · 1h 37m

The most practical episode here, and the only one written for people who sit through meetings, courses, and conferences and retain almost nothing of them. Kwik quantifies the problem (80% of single-exposure information is gone within two days) and answers it with habits you can apply this afternoon: write questions before you read, take notes by hand, split the page into capture and create, then teach someone within a day.

Key takeaways

  • Ask your questions before you read or attend. Questions prime the reticular activating system to flag relevant information as it arrives.
  • Single exposure loses about 80% of the material within two days, so schedule a deliberate second pass into the calendar.
  • Handwritten notes outperform typing because the slower pace forces you to filter and prioritize as you go.
  • Use the capture and create split: facts on the left of the page, your own connections, questions, and applications on the right.
  • Teach the material to someone within a day. Explaining it exposes the gaps that rereading hides.
When you're exposed to information just once, within 2 days 80% of it is forgotten. — Jim Kwik

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6. Accelerate Learning and Increase Cognitive Capacity: Dr. Tommy Wood

Huberman Lab · Andrew Huberman with Dr. Tommy Wood · 2h 41m

Wood names the behavioral reason most adults lose memory capacity, and it is uncomfortable: adults hate being bad at things, so they stop supplying the brain with novel input at exactly the age it needs most. His prescription is specific about which activities qualify, favoring ones that stack motor, cognitive, and social demands at once, and he backs it with a processing-speed training study whose dementia protection showed up twenty years later.

Key takeaways

  • Plasticity is about changing connections between existing neurons, so adult memory gains come from rewiring the wiring you already have.
  • Processing speed holds steady until about age 60 and then drops, which makes your fifties the window to train it.
  • Processing-speed training with booster sessions at one and three years cut dementia risk measurably two decades later.
  • Choose activities that combine motor, cognitive, and social load: ballroom or line dancing, martial arts, instruments, and team sports.
  • The Norwegian 4x4 protocol (four minutes at 85 to 95% max heart rate, three minutes rest, four rounds, three times a week) preserved hippocampal benefits for years afterward.
One of the reasons why we lose cognitive function as we get older is because we stop giving our brain novel inputs or complex inputs that help maintain function, drive neuroplasticity. And I think one of the reasons that happens is because adults hate being bad at things. — Dr. Tommy Wood

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7. Stanford Neuroscientist: Can't Remember Your Dreams? Your Brain May Be Warning You

Diary of a CEO · Steven Bartlett with Dr. David Eagleman · 1h 33m

The long-horizon companion to Eagleman's Huberman appearance, pitched at a general audience and built around cognitive reserve. The nun study is the centerpiece: brains riddled with Alzheimer's pathology that produced no symptoms, because their owners kept building new pathways through social roles and games. Eagleman's point that other people are the hardest possible stimulus for a brain reframes social life as memory training.

Key takeaways

  • Cognitive reserve lets people with visible Alzheimer's pathology stay sharp, because new pathways keep offsetting tissue loss.
  • Social interaction is the most demanding input a brain receives, since other people stay genuinely unpredictable.
  • Fluid intelligence peaks around age two and gets pruned into crystallized intelligence, which is optimization that also reduces the pressure to change.
  • Cortical real estate follows behavior: pianists expand motor areas, and people born blind repurpose visual cortex for hearing and touch.
  • Retirement accelerates decline when it removes the social and intellectual load that work supplied.
Even as the brain tissue was physically degenerating with Alzheimer's, they were making new roadways and bridges all the time. That's what kept them cognitively healthy. We call that cognitive reserve. — Dr. David Eagleman

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8. The 6 Science-Backed Brain Fixes Most People Are Ignoring

Diary of a CEO · Steven Bartlett · 1h 5m

A compilation that earns its place for one reason: it is the only episode in the set that covers sleep as the consolidation window and creatine as a cognitive buffer in the same hour. Sleep is where the encoding you did all day actually gets written down and metabolic waste gets cleared, and the creatine finding Rhonda Patrick cites, that supplementation fully offsets the cognitive cost of sleep deprivation, is the most surprising claim on this page.

Key takeaways

  • Memory consolidation and metabolic waste clearance both happen during sleep, which makes 7 to 8 hours part of the study protocol.
  • Creatine at 10 to 20 grams daily improves cognition under stress and offsets the deficits caused by sleep deprivation.
  • Two to three 45 minute aerobic sessions a week measurably improve mood, memory, and attention in previously sedentary people.
  • Adult plasticity requires focused attention to release the catecholamines that mark an experience as important, with the rewiring happening later during rest.
  • Social connection strength predicts both longevity and brain health, while loneliness creates chronic stress that physically shrinks brain tissue.
If you supplement with creatine under sleep deprivation, it completely negates the cognitive deficits of sleep deprivation. Actually, not only does it negate the cognitive deficits of sleep deprivation, it makes people function better than if they were well-rested. — Rhonda Patrick

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9. How Dopamine and Serotonin Shape Decisions, Motivation and Learning: Dr. Read Montague

Huberman Lab · Andrew Huberman with Dr. Read Montague · 2h 41m

The deepest episode here, and the one that explains why surprise is such a powerful memory ingredient. Montague shows that dopamine encodes temporal difference errors, the gap between each successive prediction, which is the same algorithm DeepMind used in AlphaGo. Practically, it means your brain writes hardest when reality departs from what you expected, which is the neural justification for quizzing yourself before you feel ready.

Key takeaways

  • Dopamine functions as a learning signal that encodes the difference between successive predictions, updating you continuously through an experience.
  • The temporal difference algorithm running in your brainstem matches the one behind AlphaGo, a rare case of biology and machine learning converging.
  • Learning tracks prediction error, so material that surprises you encodes more strongly than material that confirms what you assumed.
  • Motivation emerges from the running average of dopamine prediction errors, which is why steady progress sustains effort better than a distant payoff.
  • Chained events require this successive-prediction rule, since the older expectation-versus-outcome model fails to link a cue to a cue to a reward.
Dopamine fluctuations high and low control learning. It's also playing multiple roles. It plays a role in motivation and it may also play a role in the way you feel. — Dr. Read Montague

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10. How to Steal Thoughts Out of Anyone's Head: Oz Pearlman

Modern Wisdom · Chris Williamson with Oz Pearlman · 1h 56m

Included for the single most useful applied memory technique anyone on this list offers: the three-second name protocol. Pearlman's diagnosis is that you forget names because you failed to encode them in the first place, since the first seconds of meeting someone are flooded with social stress. His fix, listen then repeat twice then use it in the next sentence, is the same errorful-retrieval principle Castel teaches, compressed into a handshake.

Key takeaways

  • Use listen, repeat, reply: hear the name, say it back twice to confirm it, then work it into your next sentence.
  • Name recall fails at the encoding stage, because social stress in the opening seconds blocks the information from registering.
  • Ask the fourth question you would normally ask, skipping the scripted first three, which breaks both people out of autopilot and makes the exchange memorable.
  • People remember how an interaction made them feel, so anchoring information to someone's own story makes it stick for both of you.
  • Silence after a moment lets it consolidate, the conversational version of letting a steak rest.
When they say the name, you didn't actually hear it. You don't know it. If you ask them right then, you don't know the name. Your brain is going through a stressful period at that moment. Do I already know them? What's going on? You're thinking of a million things. — Oz Pearlman

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What these episodes have in common

Encoding is the bottleneck, and retrieval is how you widen it

Every episode that offers a concrete memory technique converges on the same mechanism: memory forms in proportion to the effort you spend pulling information out, and reviewing material passively feels productive while doing very little. Dr. Alan Castel calls this errorful retrieval and proves it with the Apple logo, an image you have seen thousands of times and still cannot draw reliably. Jim Kwik arrives at the same place from a different direction, prescribing questions written before you read so your attention has a target, then a handwritten capture-and-create split, then teaching the material to someone else within a day. Oz Pearlman compresses it to three seconds at a handshake: hear the name, repeat it twice, use it immediately.

Dr. Read Montague supplies the neural reason all three work. Dopamine encodes the gap between successive predictions, so the brain writes hardest at the moment reality diverges from expectation. Quizzing yourself before you feel ready manufactures that divergence on purpose. Passive review removes it entirely, which is why an hour of rereading can leave almost nothing behind while ten minutes of self-testing sticks.

Where the episodes disagree: exercise before learning or after

Dr. Wendy Suzuki and Andrew Huberman give what sounds like opposite advice. Suzuki says to train before your most demanding cognitive work, because a single 30 to 45 minute cardio session elevates attention and memory for about two hours. The Huberman Lab Essentials episode on memory says the payoff comes from spiking adrenaline in the minutes after a learning block, citing the McGaugh and Cahill work showing that a post-learning spike reduces the repetitions needed.

Both are right, because they target different stages. Exercise beforehand raises the attentional capacity you bring to encoding. A sharp spike afterward tags what you just encoded as important and strengthens consolidation. The practical schedule that satisfies both: train in the morning, do your hardest learning in the two hours that follow, then close the session with a cold shower or a short hard interval. The 6 Science-Backed Brain Fixes episode adds the third stage, since sleep that night is when the consolidation actually finishes.

Capacity compounds over decades, and difficulty is the price

The longest-range advice on this page is also the most consistent. Dr. David Eagleman tells the retiree doing daily crosswords to quit once they get good and find something they are clumsy at, because plasticity responds to challenge alone. Dr. Tommy Wood identifies the behavioral obstacle with unusual honesty: adults avoid novel activities because they hate being bad at things, and that avoidance is itself a driver of cognitive decline. His recommended activities stack motor, cognitive, and social demands at once, which is why dancing and martial arts outperform another crossword.

The numbers behind this are the strongest in the set. Suzuki's Swedish cohort found that highly fit women in their forties gained nine more years of good cognition. Wood cites processing-speed training whose dementia protection appeared twenty years after the sessions. Eagleman's nun studies found Alzheimer's pathology with no cognitive symptoms in people who stayed socially and intellectually loaded. The through-line across all three: capacity built in your forties and fifties is what your seventies draw on, and the deposits have to feel difficult to count.

Every episode referenced

Frequently Asked Questions

How can I improve my memory quickly?

Switch from rereading to self-testing, then add an adrenaline spike right after you finish. Dr. Alan Castel's errorful retrieval means quizzing yourself before you feel ready and checking afterward, and the Huberman Lab Essentials memory episode shows that cold exposure, a hard interval, or caffeine in the minutes following a study block cuts the repetitions you need. Those two changes cost nothing and work from the first session.

What is the best exercise to improve memory?

Aerobic exercise has the strongest evidence. Dr. Wendy Suzuki's work shows a single 30 to 45 minute cardio session lifts attention and memory for up to two hours, with dose-dependent gains up to roughly seven sessions a week. For long-term hippocampal protection, Dr. Tommy Wood points to the Norwegian 4x4 protocol: four minutes at 85 to 95% of max heart rate, three minutes rest, four rounds, three times weekly.

Does sleep actually improve memory?

Yes, and it is where most consolidation happens. The 6 Science-Backed Brain Fixes episode explains that during sleep the brain converts the day's encoding into durable memory while cerebrospinal fluid clears metabolic waste. Dr. Tommy Wood and Andrew Huberman both describe adult plasticity as a two-stage process: focused attention marks the experience, and the rewiring completes during subsequent sleep and rest.

Do supplements like creatine help memory?

Creatine has the most credible evidence of the supplements discussed, though it works mainly as a buffer under stress. In The 6 Science-Backed Brain Fixes, Rhonda Patrick cites research where creatine supplementation at 10 to 20 grams daily fully offset the cognitive deficits of sleep deprivation. Treat it as protection for bad weeks, with sleep, exercise, and retrieval practice doing the primary work.

Can you improve memory after 60?

Yes. Dr. Tommy Wood cites randomized trials where people in their 60s, 70s, and 80s showed structural brain changes and improved cognition after learning languages, music, or new motor skills. Dr. David Eagleman's nun studies found people with Alzheimer's pathology who stayed cognitively healthy through social and intellectual engagement. The requirement at every age is genuine difficulty: novel challenges that combine motor, cognitive, and social demands.

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