Human brain activity time-locked to perceptual event boundaries

Temporal structure has a major role in human understanding of everyday even ts. Observers are able to segment ongoing activity into temporal parts and sub-parts that are reliable, meaningful and correlated with ecologically re levant features of the action. Here we present evidence that a network of b rain regions is tuned to perceptually salient event boundaries, both during intentional event segmentation and during naive passive viewing of events. Activity within this network may provide a basis for parsing the temporall y evolving environment into meaningful units.