Institutionalized infants' concept formation ability.
D000300:Adoption; D002648:Child; D002674:Child, Institutionalized; D002675:Child, Preschool; D003210:Concept Formation; D003467:Cultural Deprivation; D002658:Developmental Disabilities; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D007361:Intelligence Tests; D007804:Language Development; D008426:Maternal Deprivation; D008606:Mental Processes; D009034:Mother-Child Relations; D012392:Rorschach Test; D013850:Thinking