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Huberman Lab · July 13, 2026 · 2h 28m

How to Improve Your Memory & Cognitive Function at Any Age | Dr. Alan Castel

Dr. Alan Castel
Show Notes

Dr. Alan Castel, a UCLA psychology professor and expert on memory and cognitive aging, explains how memory actually works—it’s not a perfect recording but a reconstructive process. He shares research on why we remember some things and forget others, the surprising power of self-testing and retrieval practice, and why curiosity and emotion stamp in long-term memories. The conversation covers SuperAgers who maintain sharp memory into old age, the photo-taking impairment effect, and false memories in eyewitness testimony, along with practical tools to maintain and improve memory at any age.

This summary was generated from show notes and public descriptions, not from a full transcript review. Details may contain inaccuracies.

Curious

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Self-Testing (Retrieval Practice) Stamps in Long-Term Memory00:04:49
Testing yourself on material, rather than simply re-reading, forces active retrieval and significantly strengthens long-term memory.
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The Nun Study and Cognitive Reserve: Why Some Brains Resist Alzheimer’s00:49:01
The landmark Nun Study showed that some nuns with full-blown Alzheimer’s pathology at autopsy had shown no cognitive decline in life, thanks to high cognitive reserve from lifelong intellectual engagement.
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Photo-Taking Impairs Memory for What You Photograph00:24:28
Taking photos can make you remember less of what you saw because you offload the memory to the camera, reducing your own mental engagement.
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SuperAgers: What They Do Differently to Keep Sharp00:57:14
‘SuperAgers’—older adults whose memory matches people decades younger—tend to engage in challenging mental activities, stay physically active, and maintain strong social connections.
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Highlights

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Memory Is Reconstructed, Not Replayed Like a Video00:02:41
Memory is not a fixed recording; it is reconstructed each time we recall it, influenced by beliefs, current mood, and the context of retrieval.
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Eyewitness Confidence Often Misleads: The Ronald Cotton Case00:29:28
The case of Ronald Cotton, wrongly convicted based on confident eyewitness misidentification, shows that memory can be extremely vivid yet completely inaccurate.
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Misc

✧The Ronald Cotton case: a man wrongly imprisoned for over ten years based on confident but mistaken eyewitness identification.
✧The Nun Study: nuns with Alzheimer’s pathology but no cognitive decline, likely due to high cognitive reserve from intellectual engagement.
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