Social responsivity in the profoundly mentally retarded.
D000293:Adolescent; D000328:Adult; D004495:Education of Persons with Intellectual Disabilities; D007839:Functional Laterality; D006225:Hand / Q000502:physiology; D006801:Humans; D008607:Intellectual Disability; D008297:Male; D008875:Middle Aged; D012919:Social Behavior; D012931:Social Environment