Development of mirror image responses in infancy.
D000367:Age Factors; D001288:Attention; D001828:Body Image; D002657:Child Development; D003448:Crying; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D009949:Orientation; D010988:Play and Playthings; D012649:Self Concept; D012737:Sex Factors; D014796:Visual Perception; D014831:Voice