title: Developmental perspectives on self and object constancy.
mesh_terms: D002675:Child, Preschool; D004532:Ego; D004645:Empathy; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008426:Maternal Deprivation; D009769:Object Attachment; D010287:Parent-Child Relations; D011574:Psychoanalytic Theory