title: How does the child know? Origins of the symbol in the theories of Piaget and Werner.
mesh_terms: D002648:Child; D002657:Child Development; D002675:Child, Preschool; D003071:Cognition; D006801:Humans; D007223:Infant; D007360:Intelligence; D009048:Motor Skills; D011574:Psychoanalytic Theory; D011582:Psychological Theory; D012649:Self Concept; D014796:Visual Perception