A new study suggests the brain begins making decisions much earlier than scientists previously thought, with researchers finding that even primary sensory regions are influenced by higher brain areas through rapid feedback loops, rather than simply passing information forward. The classical model of brain decision-making, where sensory signals enter through dedicated early regions and get processed into progressively more abstract representations as they climb the neural hierarchy until reaching the prefrontal cortex for choice, is now challenged by evidence of top-down feedback loops. This more dynamic view of brain function could help engineers design future AI systems that think more like biological brains while using far less power.
Decision-making was never just a choice happening at the top; it was always happening everywhere at once.