Lisa Feldman Barrett: Counterintuitive Ideas About How the Brain Works | Lex Fridman Podcast #129

Neuroscientist Lisa Feldman Barrett presents a framework in which the brain functions as a predictive, metabolic machine that constructs emotions, concepts, and social reality rather than merely reacting to sensory input. She argues that phenomena such as political polarization and police violence stem from the high energetic cost of updating internal models in a state of "body budget" deficit, which forces reliance on rigid stereotypes and limits empathetic engagement. Ultimately, the talk proposes that human agency is exercised by curating novel experiences to rewrite past interpretations, while collective meaning arises from the ongoing metabolic investment in social connection and curiosity.