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Journal of Speech, Language, and Hearing Research Vol.49 1380-1390 December 2006. doi:10.1044/1092-4388(2006/099)
© American Speech-Language-Hearing Association
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Reaction Times of Normal Listeners to Laryngeal, Alaryngeal, and Synthetic Speech

Paul M. Evitts
Jeff Searl
Bowling Green State University, Bowling Green, OH

Contact Author: Paul M. Evitts, who is now at Department of Communicative Disorders, West Chester University, West Chester, PA 19383. E-mail: pevitts{at}wcupa.edu.

The purpose of this study was to compare listener processing demands when decoding alaryngeal compared to laryngeal speech. Fifty-six listeners were presented with single words produced by 1 proficient speaker from 5 different modes of speech: normal, tracheosophageal (TE), esophageal (ES), electrolaryngeal (EL), and synthetic speech (SS). Cognitive processing load was indexed by listener reaction time (RT). To account for significant durational differences among the modes of speech, an RT ratio was calculated (stimulus duration divided by RT). Results indicated that the cognitive processing load was greater for ES and EL relative to normal speech. TE and normal speech did not differ in terms of RT ratio, suggesting fairly comparable cognitive demands placed on the listener. SS required greater cognitive processing load than normal and alaryngeal speech. The results are discussed relative to alaryngeal speech intelligibility and the role of the listener. Potential clinical applications and directions for future research are also presented.

KEY WORDS: alaryngeal, speech intelligibility, laryngectomy, reaction time, cognitive processing, synthetic speech


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