This study compared training in two language systems for three severely handicapped, nonvocal adolescents: the Bliss symbol system and an iconic picture system. Following baseline, training and review trials were implemented using an alternating treatments design. Daily probes were conducted to assess maintenance, stimulus generalization, and response generalization, and data were collected on spontaneous usage of either language system throughout the school day. Results showed that students required approximately four times as many trials to acquire Bliss symbols as iconic pictures, and that students maintained a higher percentage of iconic pictures. Stimulus generalization occurred in both language systems, while the number of correct responses during responses generalization probes was much greater for the iconic system. Finally, students almost always showed more iconic responses than Bliss responses in daily spontaneous usage. These results suggest that an iconic system might be more readily acquired, maintained, and generalized to daily situations. Implications of these findings for the newly verbal person were discussed.
A training program for teaching communication skills to nonvocal retarded adults was evaluated in three experiments. The four subjects were severely disabled physically and had never demonstrated functional speech. Each person was taught to use either a prosthetic head pointer or to point with a hand in using a communication board for expressive language. Following baseline in Experiment I, coordination training was implemented, consisting of instructions, manual guidance, praise, feedback, and practice. Each person demonstrated a higher frequency of accurate pointing to designated areas on the board during coordination training than during baseline. In Experiment II, identification training, consisting of instructions, praise, feedback, and practice was introduced after baseline. Subjects pointed more frequently to specific word-photograph combinations to correspond to descriptive verbal labels after introduction of identification training. Social validation measures in Experiment III indicated that the communication board skills were functional in providing a method of expressing a choice of a leisure activity to people who previously could not understand the subjects' communication attempts. The acquired skills maintained throughout a seven-week followup period.
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