Abstract
Purpose This study examines 1) whether two groups of Korean listeners (i.e., average adult listeners and speech-language pathologists) show any difference(s) in the minimal duration of the prolonged Korean fricative /s/ perceived as âabnormalâ and 2) whether the two groups perceive the prolonged sound âcategoricallyâ or âcontinuously.â Methods Fifty participants (25 average adult listeners and 25 speech-language pathologists) have been asked to identify whether each version of the plain voiceless fricative /s/ in the word san âmountainâ produced by a normally fluent Korean speaker and manipulated to create a range of prolonged sounds (i.e., from 0 ms to 380 ms by 20-ms increments) is normal (0) or abnormal (1), and to rate each version of the fricative based on a rating of normal to abnormal (or stuttered) (1 to 100). Results Results show that the minimal threshold for the prolonged sound perceived as âabnormalâ is 375 ms for average adult listeners and 355 ms for speech-language pathologists. In addition, both groups perceive the range of sounds more continuously than categorically. Also, a significant group difference exists in that speech-language pathologists rate disfluent sounds more strictly (or higher) than average adult listeners. Conclusion Speech-language pathologists are more sensitive than average adult listeners. The implications of these results are further discussed. Key Words: Stuttering, Sound prolongation, Categorical perception, Continuous perception, Korean fricative /s/ ì¤ì¬ ë¨ì´: ë§ëë¬, ë§ì리 ì°ì¥, ë¨ìì ì§ê°, ì°ìì ì§ê°, íêµì´ íë§ì°°ì âã â
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