Dr. Charan Ranganath — Professor of Psychology and Neuroscience at UC Davis and a leading researcher on human memory. Author of the book 'Why We Remember' and a rock musician in the band Pavlov's Dogz.
The gist
Huberman and Ranganath explore how memory works not as a record of the past but as a tool for navigating the present and predicting the future. They cover the neuroscience of curiosity and dopamine, the roles of the hippocampus and prefrontal cortex, and why attention can be hijacked while intention must be cultivated. The conversation turns practical with evidence-based ways to offset age-related cognitive decline and Alzheimer's risk, including sleep, exercise, diet, hearing, vision, and oral health. Ranganath also shares his personal experience with ADHD, the dangers of multitasking, and how memory can be reshaped through perspective, therapy, and neuromodulators.
Big reveals
- Ranganath admits he initially dismissed his postdoc's curiosity-and-memory study as 'a dumb topic' before it became one of his lab's coolest findings.
- Older adults are just as good as (or better than) younger people at remembering information they were told to ignore; their deficit is in remembering what they were supposed to focus on.
- Ranganath reveals his daughter told him he 'totally has ADHD,' prompting a major life overhaul including a personal trainer and an ADHD coach.
- Counterintuitively, mindlessly taking photos impoverishes memory of an experience rather than strengthening it.
- Lifestyle changes can reduce Alzheimer's risk by at least 40%, an effect as big or bigger than genetics.
- Deja vu likely arises when strong familiarity is triggered but a spatial mismatch suppresses full recollection, shown using VR environments.
- Group therapy with Vietnam vets turned individual traumatic memories into a shared collective memory that allowed healing.
Things worth remembering
- About 40% of people watching a basketball video fail to notice a person in a gorilla costume walk through (change blindness).
- When people are curious about a trivia question, dopaminergic brain activity spikes and they also better remember unrelated faces shown during that curious state.
- A University of Copenhagen PET study found non-sleep deep rest (NSDR) significantly increases striatal dopamine.
- A 29,000-person study in China found people with 4-6 healthy lifestyle factors scored nearly twice as high on memory tests after 10 years versus those with 0-1.
- Hermann Ebbinghaus found he forgot about half of memorized nonsense 'trigrams' within 20 minutes and two-thirds within 24 hours.
- Hearing aids show strong effect sizes for reducing Alzheimer's risk and supporting healthy cognitive aging.
- Transplanting gut bacteria from sugar-fed rats into normal rats reproduced the same memory deficits and hippocampal atrophy.
- The famous patient H.M. lost his perirhinal cortex bilaterally, which contributed to his dense amnesia.
- The study claiming MDMA destroys the serotonin system was retracted after researchers discovered they had inadvertently used methamphetamine.
- Ranganath wore sunglasses on stage to stop worrying about friends watching and get into flow, relating it to 'choking under pressure' research.
Recommended in this episode
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Why We Remember
Charan Ranganath
“why that titled it for the book and the question is what do you want to remember what are the memories that you want to take with you” — Charan Ranganath 01:31:21Find it on Amazon
Why We Remember
Charan Ranganath
“I want to thank you for writing your book why we remember because it's a fantastic exploration of the modern understanding of memory” — Andrew Huberman 02:34:55Find it on Amazon
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“I have a new book coming out it's my very first book it's entitled protocols an operating manual for the human body” — Andrew Huberman 02:37:03Find it on Amazon