The peek-a-boo game. I. Its origins, meanings, and related phenomena in the first year.
D000374:Aggression; D002648:Child; D002657:Child Development; D002675:Child, Preschool; D003210:Concept Formation; D004532:Ego; D005106:Exploratory Behavior; D005260:Female; D006801:Humans; D007100:Imitative Behavior; D007223:Infant; D010287:Parent-Child Relations; D010988:Play and Playthings; D011574:Psychoanalytic Theory