[PERCEPTION OF THE MUELLER-LYER AND OPPEL-KUNDT ILLUSIONS IN MENTAL DEFICIENCY].
D000293:Adolescent; D002648:Child; D006801:Humans; D007088:Illusions; D008607:Intellectual Disability; D010465:Perception; D014796:Visual Perception
ADOLESCENCE; CHILD; ILLUSIONS; MENTAL RETARDATION; VISUAL PERCEPTION