title: Perceptual judgments in Piaget's conservation-of-liquid problem.
mesh_terms: D002648:Child; D002657:Child Development; D002675:Child, Preschool; D003071:Cognition; D005260:Female; D006801:Humans; D007600:Judgment; D008297:Male; D011582:Psychological Theory; D013028:Space Perception; D014705:Verbal Behavior; D014796:Visual Perception