title: Theories of object relations: a metapsychological assessment.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002657:Child Development; D002675:Child, Preschool; D004328:Drive; D004532:Ego; D005619:Freudian Theory; D006801:Humans; D007223:Infant; D009042:Motivation; D009769:Object Attachment; D010554:Personality Disorders / Q000523:psychology; D011574:Psychoanalytic Theory; D011618:Psychotic Disorders / Q000523:psychology; D012931:Social Environment