title: Teaching functional speech to the severely handicapped: current issues.
mesh_terms: D002648:Child; D003216:Conditioning, Operant; D006801:Humans; D007100:Imitative Behavior; D007804:Language Development; D009155:Mutism / Q000534:rehabilitation*; D009633:Nonverbal Communication; D012054:Reinforcement, Psychology; D012660:Semantics; D012813:Sign Language; D013070:Speech Therapy / Q000379:methods*; D014706:Verbal Learning