A methodological investigation of Piaget's theory of object concept development in the sensory-motor period.
D000367:Age Factors; D003071:Cognition; D003210:Concept Formation; D004192:Discrimination, Psychological; D005106:Exploratory Behavior; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D009068:Movement; D014796:Visual Perception