This study is aimed to promote the communication behavior in a profoundly mentally handicapped autistic boy (CA 7 : 3, MA 2 : 6, IQ 34) and girl (CA 8 : 2, immeasurable) by using a play script that is structured by the therapist. The play is titled "Treasure-hunting". It consists of 6 scenes ; "The departure", "Ticket Buying", "A Voyage in Quest of Treasure", "A Heavy Rainfall", "A Monstrous Animal", "The Discovery of the Treaure". The subjects were trained one after another to perform 8 interactive and 9 noninteractive behaviors according to the story. When the subjects didn't perform the above mentioned behaviors or expected behaviors, promptor gave the subjects either a suggestion, physical guidance, direction, or a role model. As a result of 6 training sessions, the autistic boy developed a series of noninteractive behaviors he spontaneously performed, but communicative behaviors remained partially acquired because of confusion about the roles. In the retarded girl, all behaviors were acquired sucussesively. Especially communicative behaviors were transformed from gestures to verbal form.
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