Dwell times showcase how goal structure informs preschoolers' analysis of unfolding motion patterns

Using Hard et al.'s (2011) dwell-time paradigm, 85 preschoolers (aged 2.5-4.5; 43 female; primarily from white families) advanced at their own pace through one of three slideshows. All slideshows depicted an actor reaching toward, grasping, and retrieving a ball. However, motion patterns differed for one slideshow (straight-reach) relative to the other two (arcing-reaches), and one of the arcing-reach slideshows depicted a violation of typical goal-related motion. Preschoolers' knowledge of goal structure systematically modulated attention to event boundaries across slideshows despite surface differences, even when controlling for pixel change (an index of changes in motion). These findings showcase the value of the dwell time paradigm, and illuminate how children deploy attention as goal-related expectations shape their analysis of continuously unfolding activity.