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Why Memory is Unpredictable & How to Improve it | Dr. Alan Castel & Dr. Andrew Huberman

Huberman Lab Clips10:46Added Aug 31, 2026

Dr. Alan Castel and Dr. Andrew Huberman discuss the reconstructive nature of human memory, the selection process involved in "timestamping" specific moments, and how memory contamination reveals that high confidence does not always correlate with recall accuracy.

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Contributed by 刘嘉琪

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  1. Taking Mental Pictures

  2. 00:00A long time ago, I decided um I was in a
  3. 00:02in a really cool circumstance. I was on
  4. 00:05a picnic. It was my first girlfriend.
  5. 00:07And I remember thinking like, gosh,
  6. 00:08she's so beautiful. I'm just going to
  7. 00:09take a picture. We were just sitting at
  8. 00:11this park that's up in the hills behind
  9. 00:13uh where I used to live. And I just went
  10. 00:15and I decided, okay, like I remember the
  11. 00:17picture. Now, of course, in my mind now,
  12. 00:19it's it's blurry. Like I don't remember
  13. 00:21specific details, but I remember more or
  14. 00:22less I think I remember that the angle
  15. 00:25was that. And then
  16. 00:26like a year and a half ago, I was in uh
  17. 00:28Manhattan. and I was in an Uber and I
  18. 00:31just was like maybe I could just do that
  19. 00:32for a like a trivial
  20. 00:34street scene. So I just like look there
  21. 00:36was that one of those scaffolds for
  22. 00:37construction and I just decided you just
  23. 00:40do that and there was a guy walking by
  24. 00:41and I'm like I wonder if I'll remember
  25. 00:42it and I still remember it. Now the
  26. 00:44question I have is do I actually
  27. 00:46remember the content of what I saw
  28. 00:50besides just their crude you know the
  29. 00:52scaffold the guy in one case you know my
  30. 00:54my girlfriend we were sitting on this
  31. 00:56nice big lawn above there this lake
  32. 00:58there it's it's a beautiful spot uh in
  33. 01:01Palto still there or is what's stamped
  34. 01:04in my decision to do that and the and
  35. 01:07the sort of conscious collection of it
  36. 01:10is are is it these weren't like big
  37. 01:13emotionally salient events where the the
  38. 01:15difference between these visual memories
  39. 01:17and other visual memories is that the
  40. 01:20emotional load wasn't that high,
  41. 01:23but I made the decision to do it. It was
  42. 01:25like it was coming from me. It wasn't.
  43. 01:27So, I'm not just trying to remember like
  44. 01:29like we also went to was her senior my
  45. 01:31junior prom. Like I don't I remember a
  46. 01:33few things from that prom,
  47. 01:35but I can't reme I don't have a visual
  48. 01:37picture of the prom. But the prom was
  49. 01:39also a lot more emotionally,
  50. 01:42you know, laden than anything I just
  51. 01:44described. Does that make sense?
  52. 01:46Yeah, it's a fascinating question
  53. 01:47because I think selection is the
  54. 01:48important thing here that you're making
  55. 01:50a conscious decision like this is a
  56. 01:52special moment. Can I just take a

  57. Memory Selection Process

  58. 01:53picture of it? And the work on visual
  59. 01:55memory is interesting. We are very
  60. 01:57visual people. But the research on
  61. 02:00photographic memory does show that even
  62. 02:02people who have very strong visual
  63. 02:03memory will make memory errors. So it's
  64. 02:06not that you know it's exactly
  65. 02:07photographic but their visual memory is
  66. 02:10exceptional. I think what's interesting
  67. 02:11here and this is something I think is
  68. 02:13important is the selection process that
  69. 02:15you're choosing. This is a special
  70. 02:16moment. I'm going to time stamp it and
  71. 02:18remember it.
  72. 02:19You're not, you know, doing anything
  73. 02:21special other than realizing a lot is
  74. 02:23going on now. There's probably some
  75. 02:24emotional veilance there versus taking
  76. 02:26this random picture in New York City.
  77. 02:29And it would be interesting to kind of
  78. 02:30test your memory later because we know
  79. 02:32sometimes we think we remember something
  80. 02:34well and in fact we misremember things
  81. 02:36or details and hopefully you know you
  82. 02:38got the right girlfriend of course but
  83. 02:40maybe the hill looks a little bit
  84. 02:41different or sometimes people are like
  85. 02:42of course it was spring cuz we went to
  86. 02:44the prom but it's like no actually now
  87. 02:46that you know we it was a different
  88. 02:47season entirely that was fall and
  89. 02:49confusing with the other picnic I took.
  90. 02:52But I think that's important especially
  91. 02:53as you know we get older that there are
  92. 02:55some memories these days we have our

  93. How Phones Affect Memory

  94. 02:57phones for everything. So you probably
  95. 02:58you probably couldn't then, but you
  96. 03:00could have pulled out your phone and
  97. 03:01actually taken a picture. And you see a
  98. 03:02lot of people offloading information
  99. 03:04now.
  100. 03:05You know, I'm not going to remember
  101. 03:06this. I'll take a picture. There is some
  102. 03:08research showing that that act of
  103. 03:10deciding to take the picture actually
  104. 03:12improves your own memory
  105. 03:14for the event.
  106. 03:15For the event.
  107. 03:16Interesting.
  108. 03:16Now, it can also make your memory worse
  109. 03:18because you're realizing I want to I'm
  110. 03:20taking this photo so I don't need to
  111. 03:22remember it later. And so you could see
  112. 03:24it going both ways. But that selection
  113. 03:27process is important. So sometimes
  114. 03:29you're choosing this is mundane. I'm
  115. 03:31going to offload it and take a picture.
  116. 03:33Or this is a special moment. I want to
  117. 03:35take this picture. And I see it, you
  118. 03:36know, when I take pictures of my family.
  119. 03:38This is a special moment. I want to take
  120. 03:39this photo. But there are times where
  121. 03:41I'm like, I don't have my camera. I
  122. 03:43don't want to interfere. This is going
  123. 03:45to be like an internal memory that I can
  124. 03:47take. Um, and hopefully it lasts
  125. 03:49forever.
  126. 03:50I tell myself that my mindset at the
  127. 03:52time was this is a special moment. I
  128. 03:54never want to forget this. Yeah,

  129. Memory As Reconstruction

  130. 03:56I hope I never forget it.
  131. 03:58Well, you know, memory is reconstructive
  132. 03:59and I think, you know, the more you
  133. 04:01retrieve it and go back there, the more
  134. 04:02you'll have this feeling of remembering
  135. 04:04it. And our brain does a lot of
  136. 04:06interesting things in terms of, you
  137. 04:08know, reconstructing the past also has a
  138. 04:11similar brain signature as imagining the
  139. 04:13future, which you know, in some ways
  140. 04:15makes sense. We shouldn't have separate
  141. 04:17parts of the brain for thinking about
  142. 04:18the past and thinking about the future.
  143. 04:20But that can kind of then predict why
  144. 04:22you might misremember something, why
  145. 04:24your imagination has to be based surely
  146. 04:26on the experiences you've had already,
  147. 04:29right? Or you know, if I say what would
  148. 04:31it be like to go to Mars? Well, you've
  149. 04:33never been to Mars, but you've seen
  150. 04:35movies in the past about it. So our, you
  151. 04:37know, if I said imagine a space alien,
  152. 04:40you and I being similar age are probably
  153. 04:42going to think of the ET version of one,
  154. 04:44whereas someone who's younger than us
  155. 04:46might have a very different kind of
  156. 04:48representation of that. So it's
  157. 04:50interesting to think of memory as kind
  158. 04:52of a reconstruction of the past, but
  159. 04:53also imagining the future involves, you
  160. 04:56know, our past experiences.
  161. 04:58Never thought about it that way. It's
  162. 05:00the perfect time, I think, to raise the
  163. 05:03quote that uh a former guest on this
  164. 05:05podcast put on social media the other
  165. 05:07day. They weren't his words, but this
  166. 05:09Morgan Howell, who did a really
  167. 05:11wonderful episode on the psychology of
  168. 05:14money. Um, and I I really love his first
  169. 05:17book, but also his second book, The Art
  170. 05:18of Spending Money. Um, he put out a he
  171. 05:22said it's a Russian quote, "The past is
  172. 05:24more unpredictable than the future."
  173. 05:27Yeah. Goodness, that raises questions
  174. 05:29about eyewitness testimony. Um, spousal
  175. 05:33arguments. You know, I occasionally will
  176. 05:34get an email, my wife and I are have a
  177. 05:36debate or my husband and I are debate
  178. 05:38and and I have a rule. I I don't get
  179. 05:40into uh spousal uh debates or arguments
  180. 05:44of any kind. So,
  181. 05:46do we remember things the way they
  182. 05:47happened or do we confabulate uh do we
  183. 05:50um muck it all up?
  184. 05:52You know, I don't think we muck it all
  185. 05:53up and I don't think we do it
  186. 05:54intentionally either. But as a result of
  187. 05:57all the information we have in our
  188. 05:58memory, we're constantly interpreting,
  189. 06:00you know, the future and our current
  190. 06:02state. And you spoke a little bit about
  191. 06:05eyewitness memory. I think that's a
  192. 06:06really good example of that where
  193. 06:08something horrible might have happened

  194. Faulty Eyewitness Identification

  195. 06:10and like your experience where you think
  196. 06:12you're taking a picture and you're going
  197. 06:13to remember everything and it feels like
  198. 06:15you will. I can remember the shirt. I
  199. 06:17can remember the smell. I can remember
  200. 06:19the weather. Um, and sometimes that can
  201. 06:21be accurate. A lot of research shows
  202. 06:23that sometimes we misremember these
  203. 06:25things. In some of these classic cases,
  204. 06:27unfortunately, um, you know, now that
  205. 06:29there's DNA evidence, you can determine
  206. 06:31that maybe they got the wrong person.
  207. 06:33And when that happens, you want to look
  208. 06:35back and say, "How could that happen?"
  209. 06:37And some of it comes down to faulty
  210. 06:38eyewitness identification. And these are
  211. 06:42not cases where people are lying or
  212. 06:44intentionally changing things, but
  213. 06:46they'll identify someone. They'll say,
  214. 06:48"That's the person." And as a result of
  215. 06:51identifying that person in a lineup,
  216. 06:53that person then replaces what they
  217. 06:55actually saw. So our memory can be
  218. 06:57contaminated just like any form of
  219. 06:59evidence could be contaminated. And then
  220. 07:01when you replay it again, you're
  221. 07:03replaying the person you identified, not
  222. 07:05the person you actually saw.
  223. 07:07Wow. So it's almost like we as we become
  224. 07:10more familiar with this person that we
  225. 07:12identified, quote unquote, our knowledge
  226. 07:15about them, facial features, etc. is is
  227. 07:18elaborated in our brain and we
  228. 07:19superimpose that on the actual
  229. 07:22experience.

  230. Ronald Cotton Case

  231. 07:23Yeah. And and this is you know one of
  232. 07:25the most famous cases Ronald Cotton case
  233. 07:27where really horrible event happened um
  234. 07:30and the woman made a point of trying to
  235. 07:32remember her attacker. So it wasn't just
  236. 07:34she got a quick glance but she had a
  237. 07:36long interaction with him and that's you
  238. 07:38know a traumatic event and she said if I
  239. 07:40survive this I want to remember his face
  240. 07:43so I can identify him later. So this is
  241. 07:44like the the perfect situation where
  242. 07:46your memory should be sharp. And um it
  243. 07:50was crossra identification which we know
  244. 07:52is not as reliable as identifying
  245. 07:54someone of your own race. And when she
  246. 07:56saw a lineup she identified she took her
  247. 07:59time and said this feels like it's a
  248. 08:00multiplechoice test. And I studied hard
  249. 08:03for it. She took her time and she
  250. 08:05identified the person and she thought in
  251. 08:08her mind this is the person who was
  252. 08:09inches from my throat. um and she
  253. 08:12identified him and he had a an alibi
  254. 08:14that didn't stand up and he was you know
  255. 08:17then you know found guilty and it was
  256. 08:20only you know decades later that DNA
  257. 08:23evidence exonerated him and she felt
  258. 08:25horrible. um she felt like, you know,
  259. 08:28and there's a lot of reasons why this
  260. 08:29could happen, you know, whether leading
  261. 08:31questions or how the identification
  262. 08:33process was conducted, but she was
  263. 08:36trying to do what she felt was her job
  264. 08:38and take someone who she thought was
  265. 08:40guilty off the street and um later they
  266. 08:43got to meet in fact and she you know
  267. 08:47could apologize to him. She felt
  268. 08:48terrible. And so this is one case study
  269. 08:51and you know I wouldn't draw any
  270. 08:53conclusions but it had a lot of the
  271. 08:55principles that we've talked about where
  272. 08:57you feel like you're taking a photo.
  273. 08:59It's a cross race identification where
  274. 09:02your confidence might be high for good
  275. 09:04reason um but accuracy might not be and
  276. 09:07then this kind of changing of the face
  277. 09:10whereas once you identify the face
  278. 09:11that's what you start to remember and so
  279. 09:14I think there's a lot of interesting
  280. 09:15memory principles at play here. How does

  281. Memory In Legal Systems

  282. 09:18the legal system deal with this kind of
  283. 09:19thing? I mean nowadays there's so many
  284. 09:21more cameras and phones which can track
  285. 09:23location. I like to think those things
  286. 09:25have improved the courtroom scenarios uh
  287. 09:30that it's harder for people to make
  288. 09:31genuine mistakes.
  289. 09:33Yeah. I think it's you know memory
  290. 09:34should be treated as one source of
  291. 09:36evidence just like DNA just like any
  292. 09:38sort of evidence but also we need to be
  293. 09:40aware that it can be contaminated just
  294. 09:42like any other source of evidence as
  295. 09:44well. So we can't just say oh well DNA
  296. 09:45evidence is perfect. Well, it can also
  297. 09:47be contaminated in predictable ways. And
  298. 09:50I think, you know, coming back to this
  299. 09:51idea of metacognition, most people feel
  300. 09:53like they have a pretty good
  301. 09:54understanding of how memory works,
  302. 09:57but it's not always accurate. And
  303. 09:59sometimes confidence, high confidence
  304. 10:01doesn't necessarily mean high accuracy.

  305. Confidence Versus Accuracy

  306. 10:04And I think part of the reason we're
  307. 10:05fooled is usually, you know, the more
  308. 10:07you see something, the better you'll
  309. 10:08remember it, just like the Apple logo.
  310. 10:10But that's not always the case. And
  311. 10:12there's predictable reasons why. the
  312. 10:14more you see something, the more you
  313. 10:16might stop attending to the features or
  314. 10:18you don't need to use it. And so that is
  315. 10:20a more kind of predictable memory
  316. 10:22principle. But we don't have this, you
  317. 10:24know, always accurate metacognitive
  318. 10:27insight. And I I think that's
  319. 10:28interesting. I think that's both
  320. 10:30concerning, you know, in the eyewitness
  321. 10:32memory case, but it's also important for
  322. 10:34learning. How can we be kind of
  323. 10:35effective and maximize our learning?
  324. 10:38[music]