Andrew Huberman· PhD
But if you hate the cold water, if you're afraid of drowning and you get into water and put your head under and survive, then the anterior mid-cingulate cortex gets bigger. But if you don't do it the next day or if you do it the next day and you enjoy it because, hey, hey, I did it yesterday, woo-hoo, happy me, Merry Christmas as you would say--