Andrew Huberman· PhD
the second I think is perhaps even more fascinating it's called memory replay and this was discovered back in the probably 1990s Bruce mcnorton um at the University of Arizona working with a young Matt Wilson who not uh I'm Matt Walker he's Matt Wilson at MIT now they were looking at rats and they were looking at how rats learn a maze and they had these electrodes in these hippocampal brain regions um these memory related regions that we've been discussing and they were listening to the individual firing patterns of those memory cells in the hippocampus as they were running around the Maze and sure enough as they ran around the maze statistically you would build up what looked like the signature pattern of learning so think about those neurons that they each had a special tone to them and as the rat is running around the maze you can hear the signature of learning I just me it over and over again but then they did something clever when the rats went to sleep after learning they kept listening what did they hear they didn't just hear noise they heard that same memory signature replayed however it wasn't replayed at the same speed it was replayed somewhere between 10 to 20 times faster