Effects of Speech Output Type, Message Length, and Reauditorization on Perceptions of the Communicative Competence of an Adult AAC User

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Abstract
The effects of speech output type, aided message length, and partner reauditorization on naive observers’ perceptions of the communicative competence of an adult augmentative and alternative communication (AAC) system user were examined. Subjects consisted of 48 naive adults with minimal exposure to nonspeaking persons. Eight scripted videotaped conversational conditions involving an AAC user and a normal-speaking partner were employed in the manipulation of the three independent variables. A balanced incomplete block design was used. Following each viewing, subjects completed a questionnaire designed to assess the communicative competence of the AAC user. Results indicated a significant main effect for aided message length only. Ratings of the AAC user were higher in conditions with phrases than in conditions with single-word messages. Of interest was the finding that the use of digitized versus synthesized speech output had no effect on observer ratings. Clinical implications are discussed.