Aging Brains Blend Memories Together Instead of Just Forgetting Them

Re:Aging Brains Blend Memories Together Instead of Just Forg... by LorenPechtel on Wednesday September 02, 2026 @03:39PM (#49541316)

I don't think there is a "full" state, but watching the changes as the years go by I have thought of collisions. Not really like a hash table, though--most collisions are with things that would be filed together. I think it's more like the brain returns a random item matching the category. Brains are expensive, memory that gets fuzzy with age is probably the better choice than trying to feed a brain that does better.

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Re:Aging Brains Blend Memories Together Instead of Just Forg... by HarHarVeryFunny on Wednesday September 02, 2026 @05:01PM (#49542506)

Yes, evolution is not going to penalize everyone with a "100-year brain" when the rest of our body seems optimized for something more like a 30-40 year lifespan. Evolution is all about propagating your genes, and not too many 100-year olds are going to be doing that!

In any case, fuzzy associative recall is really the "design spec" for a brain, so semi-graceful degradation and fuzzy recall comes for free.

I'm not sure if old-age memory unreliability is totally random - I would not expect it to be. I'd expect these associative recall failures to happen when there are too many memories partially matching the same "key" (activation pattern), which presumably happens mostly when they do have something in common.

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