"Just Predicting The Next Word": How Our Own Brains Resemble AI

Send us Fan Mail📖 Read the companion article📡 Now available for broadcast on PRXAre you building sentences like an architect—nested grammatical trees and clean constituents? Or are you laying down the next available brick, relying on linear probability-driven chunks that “shouldn’t” exist as units at all?In this Deep Dive, we unpack new evidence that the brain represents certain non-hierarchical language structures (like VERB + PREPOSITION + DETERMINER: “sat on the”) as real cognitive objects. The findings converge across priming experiments, eye-tracked reading, and natural conversation data—suggesting that everyday speech is often optimized for speed under the “now-or-never bottleneck.”We end with the provocative mirror this holds up to AI: if humans often speak by surfing probability, what does that mean for how we judge next-word prediction models?ReferencesEvidence for the representation of non-hierarchical structures in languageSeries:The Predictive Mind: How Your Brain Cheats Reality (And Why That's Brilliant) (S6 E23)  "Just Predicting The Next Word": How Our Own Brain Resembles AI  Jan 28, 2026(S6 E28 ) The Brilliant Laziness of Being Human: Why Your Brain Refuses to Plan Ahead (And That’s Actually Perfect)  Feb 7, 2026(S6 E30 ) Your Brain Is a Time Traveller (And It's Been Lying to You About the Past)  Feb 11, 2026This is Heliox: Where Evidence Meets EmpathyIndependent, moderated, timely, deep, gentle, clinical, global, and community conversations about things that matter.  Breathe Easy, we go deep and lightly surface the big ideas. Support the showDisclosure: This podcast uses AI-generated synthetic voices for a material portion of the audio content, in line with Apple Podcasts guidelines. We make rigorous science accessible, accurate, and unforgettable.Produced by Michelle Bruecker and Scott Bleackley, it features reviews of emerging research and ideas from leading thinkers, curated under our creative direction with AI assistance for voice, imagery, and composition. Systemic voices and illustrative images of people are representative tools, not depictions of specific individuals.We dive deep into peer-reviewed research, pre-prints, and major scientific works—then bring them to life through the stories of the researchers themselves. Complex ideas become clear. Obscure discoveries become conversation starters. And you walk away understanding not just what scientists discovered, but why it matters and how they got there.Independent, moderated, timely, deep, gentle, clinical, global, and community conversations about things that matter.  Breathe Easy, we go deep and lightly surface the big ideas.Spoken word, short and sweet, with rhythm and a catchy beat.http://tinyurl.com/stonefolksongs