Teaching a picture language to a non-speaking retarded boy.
D000293:Adolescent; D001244:Association; D004495:Education of Persons with Intellectual Disabilities; D005556:Form Perception; D005795:Generalization, Stimulus; D006311:Hearing Disorders / Q000150:complications; D006801:Humans; D008607:Intellectual Disability / Q000150:complications; D007802:Language; D008297:Male; D014796:Visual Perception