Individual Talker Differences in VOT: Salience Filtering Mechanism

서지정보

· 발행기관 : 학습자중심교과교육학회
· 수록지 정보 : 학습자중심교과교육연구 / 19권 / 19호 / 1463 ~ 1487페이지
· 저자명 : 김태은

초록

Previous studies attested that the operationalization of speech perception during speech acts requires mapping to determine the point of salience, the point at which a sound becomes distinguishable. Temporal acoustic cues such as voice-onset-time (VOT) strongly signal salience to talkers, in particular, perception during the voicing contrasts in stop consonants. This paper examined the salient perceptual cues of stop voicing consonants for differences in phonemic categories, comparing VOT and speaking rate for: 1) how Korean learners of English as individual talkers perceive and utilize salience filters; 2) if they differ from one another in VOT productions; and 3) if not, how native English talkers in the speech production differ from Korean learners and what kind of acoustic cues operationalize salience in speech production. The experiment on eight subjects (7 Korean and 1 Native talkers) producing 36 monosyllabic English words beginning with voiceless/voiced stops was conducted and the outcomes indicated that (1) VOT increased as rate decreased for all 8 talkers, but the increase ratio varied significantly across talkers; (2) VOT varied systematically for voiced stops and was stable across all 8 talkers; (3) however, for voiceless stops, 3 Koreans showed asymmetry against speaking rate; revealing that Koreans implement VOT less as salience filters for the voiceless stops in contrast to the native speaker. These findings suggest two contributing factors regarding Koreans’ language-specific knowledge and how variability in production is structured in the target language: either altering salience filters from voicing to tensity or L1 transfer effect caused by different phonological rules between L1 (Korean) and L2 (English).

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