Coordination of Prephonatory Events in Mild and Severe Stutterers
Many physiologically-based models of stuttering that associate laryngeal dysfunction with the disorder (Van Riper, 1971; Adams, 1978; Zimmermann, Smith & Hanley, 1981) share the hypothesis that stutterers have difficulty controlling the rapid initiation and termination of voicing. This hypothesis is supported by behavioral and physiological data drawn from samples of stutterers’ connected speech. Behavioral data show that stutterers demonstrate greater frequency of disfluency and less adaptation when reading aloud passages containing both voiced and voiceless segments than passages containing only voiced segments (Adams and Reis, 1971, 1974; Adams, Riemenschnieder, Metz & Conture, 1975). Physiologic data, obtained from fiberoptic viewing of the vocal folds (Conture, McCall & Brewer, 1977) and the recording of electromyographic (EMG) signals from intrinsic laryngeal muscles (Freeman and Ushijima, 1978; Shapiro, 1980), reveal evidence of abnormal laryngeal activity during stutterers’ disfluent utterances.
KeywordsSoft Mode Hearing Research Abdominal Compression Connected Speech Laryngeal Movement
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