Edward Gibson: Human Language, Psycholinguistics, Syntax, Grammar & LLMs | Lex Fridman Podcast #426

Human language functions as a communication system distinct from thought, as evidenced by fMRI data showing that language-specific brain networks remain inactive during non-linguistic cognitive tasks like chess or programming. Dependency grammar provides a robust framework for understanding language, revealing that human languages universally favor short dependencies to minimize cognitive load during production and comprehension. While large language models excel at mastering the surface form of language, they often fail to grasp underlying meaning, as seen in their inability to solve logic puzzles like the Monty Hall problem. Research into remote, non-industrialized cultures, such as the Pirahã, demonstrates that language is a flexible, invented tool shaped by specific cultural needs, such as the absence of exact counting words where they are not functionally required. Legalese, conversely, suffers from excessive center-embedding, which creates unnecessary cognitive friction for both laypeople and legal professionals.