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Charan Ranganath

๐Ÿ‘ค Speaker
3063 total appearances

Appearances Over Time

Podcast Appearances

Lex Fridman Podcast
#430 โ€“ Charan Ranganath: Human Memory, Imagination, Deja Vu, and False Memories

And what we see is that the hippocampus and these other networks that are involved in generating these internal models of events, they show a heightened period of connectivity or correlated activity during those breaks between different events, which we call event boundaries. These are the points where you're surprised or you cross from one room to another and so forth.

Lex Fridman Podcast
#430 โ€“ Charan Ranganath: Human Memory, Imagination, Deja Vu, and False Memories

And that communication is associated with a bump of activity in the hippocampus and better memory. And so if people have a very good internal model throughout that event you don't need to do much memory processing you're in a predictive mode right and so then at these event boundaries you encode and then you retrieve and you're like okay wait a minute what's going on here

Lex Fridman Podcast
#430 โ€“ Charan Ranganath: Human Memory, Imagination, Deja Vu, and False Memories

And that communication is associated with a bump of activity in the hippocampus and better memory. And so if people have a very good internal model throughout that event you don't need to do much memory processing you're in a predictive mode right and so then at these event boundaries you encode and then you retrieve and you're like okay wait a minute what's going on here

Lex Fridman Podcast
#430 โ€“ Charan Ranganath: Human Memory, Imagination, Deja Vu, and False Memories

And that communication is associated with a bump of activity in the hippocampus and better memory. And so if people have a very good internal model throughout that event you don't need to do much memory processing you're in a predictive mode right and so then at these event boundaries you encode and then you retrieve and you're like okay wait a minute what's going on here

Lex Fridman Podcast
#430 โ€“ Charan Ranganath: Human Memory, Imagination, Deja Vu, and False Memories

Ranganath is now talking about orcas. What's going on? And maybe you have to go back and remember reading my book to pull out the episodic memory to make sense of whatever it is I'm babbling about, right? And so there's this beautiful dynamics that you can see in the brain of these different networks that are coming together and then de-affiliating at different points in time.

Lex Fridman Podcast
#430 โ€“ Charan Ranganath: Human Memory, Imagination, Deja Vu, and False Memories

Ranganath is now talking about orcas. What's going on? And maybe you have to go back and remember reading my book to pull out the episodic memory to make sense of whatever it is I'm babbling about, right? And so there's this beautiful dynamics that you can see in the brain of these different networks that are coming together and then de-affiliating at different points in time.

Lex Fridman Podcast
#430 โ€“ Charan Ranganath: Human Memory, Imagination, Deja Vu, and False Memories

Ranganath is now talking about orcas. What's going on? And maybe you have to go back and remember reading my book to pull out the episodic memory to make sense of whatever it is I'm babbling about, right? And so there's this beautiful dynamics that you can see in the brain of these different networks that are coming together and then de-affiliating at different points in time.

Lex Fridman Podcast
#430 โ€“ Charan Ranganath: Human Memory, Imagination, Deja Vu, and False Memories

that are allowing you to go into these modes. And so to speak to your original question, to some extent when we're talking about semantic memory and episodic memory and working memory, you can think about it as these processes that are unfolding as these networks kind of come together and pull apart.

Lex Fridman Podcast
#430 โ€“ Charan Ranganath: Human Memory, Imagination, Deja Vu, and False Memories

that are allowing you to go into these modes. And so to speak to your original question, to some extent when we're talking about semantic memory and episodic memory and working memory, you can think about it as these processes that are unfolding as these networks kind of come together and pull apart.

Lex Fridman Podcast
#430 โ€“ Charan Ranganath: Human Memory, Imagination, Deja Vu, and False Memories

that are allowing you to go into these modes. And so to speak to your original question, to some extent when we're talking about semantic memory and episodic memory and working memory, you can think about it as these processes that are unfolding as these networks kind of come together and pull apart.

Lex Fridman Podcast
#430 โ€“ Charan Ranganath: Human Memory, Imagination, Deja Vu, and False Memories

I think improvement, it depends on what your definition of optimal is. So what I say in the book is that you don't want to remember more. You want to remember better, which means focusing on the things that are important. And that's what our brains are designed to do.

Lex Fridman Podcast
#430 โ€“ Charan Ranganath: Human Memory, Imagination, Deja Vu, and False Memories

I think improvement, it depends on what your definition of optimal is. So what I say in the book is that you don't want to remember more. You want to remember better, which means focusing on the things that are important. And that's what our brains are designed to do.

Lex Fridman Podcast
#430 โ€“ Charan Ranganath: Human Memory, Imagination, Deja Vu, and False Memories

I think improvement, it depends on what your definition of optimal is. So what I say in the book is that you don't want to remember more. You want to remember better, which means focusing on the things that are important. And that's what our brains are designed to do.

Lex Fridman Podcast
#430 โ€“ Charan Ranganath: Human Memory, Imagination, Deja Vu, and False Memories

So if you go back to the earliest quantitative studies of memory by Ebbinghaus, what you see is that he was trying so hard to memorize this arbitrary nonsense. And within a day, he lost about 60% of that information. And he was basically using a very, very generous way of measuring it, right?

Lex Fridman Podcast
#430 โ€“ Charan Ranganath: Human Memory, Imagination, Deja Vu, and False Memories

So if you go back to the earliest quantitative studies of memory by Ebbinghaus, what you see is that he was trying so hard to memorize this arbitrary nonsense. And within a day, he lost about 60% of that information. And he was basically using a very, very generous way of measuring it, right?

Lex Fridman Podcast
#430 โ€“ Charan Ranganath: Human Memory, Imagination, Deja Vu, and False Memories

So if you go back to the earliest quantitative studies of memory by Ebbinghaus, what you see is that he was trying so hard to memorize this arbitrary nonsense. And within a day, he lost about 60% of that information. And he was basically using a very, very generous way of measuring it, right?

Lex Fridman Podcast
#430 โ€“ Charan Ranganath: Human Memory, Imagination, Deja Vu, and False Memories

So as far as we know, nobody has managed to violate those basics of having people forget most of their experiences. So if your expectation is that you should remember everything and that's what your optimal is, you're already off because this is not what human brains are designed to do. On the other hand,

Lex Fridman Podcast
#430 โ€“ Charan Ranganath: Human Memory, Imagination, Deja Vu, and False Memories

So as far as we know, nobody has managed to violate those basics of having people forget most of their experiences. So if your expectation is that you should remember everything and that's what your optimal is, you're already off because this is not what human brains are designed to do. On the other hand,

Lex Fridman Podcast
#430 โ€“ Charan Ranganath: Human Memory, Imagination, Deja Vu, and False Memories

So as far as we know, nobody has managed to violate those basics of having people forget most of their experiences. So if your expectation is that you should remember everything and that's what your optimal is, you're already off because this is not what human brains are designed to do. On the other hand,

Lex Fridman Podcast
#430 โ€“ Charan Ranganath: Human Memory, Imagination, Deja Vu, and False Memories

what we see over and over again is that the brain does basically one of the cool things about the design of the brain is it's always less is more, less is more, right? It's like, I mean, I've seen estimates that the human brain uses something like 12 to 20 Watts, you know, in a day. I mean, that's just nuts, the low power consumption, right?