Examined infants' categorization using object manipulation tasks that involved objects that were models of animals, vehicles, or furniture. Objects were normal, had anomalous moving parts (such as a dog with wheels), or had different textures. Found that 14- to 22-month olds attended to the parts and structural configuration of objects, but not to…

Two experiments used object-manipulation tasks to examine whether one- to two-year-olds form superordinate-like categories by attending to object parts. Findings indicated that 14- and 18-month-olds behaved systematically toward categories with different, but not matching, parts. Without part differences, none formed superordinate categories.…