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作者机构:UNIV PENN DEPT PSYCHOL PHILADELPHIA PA 19104 USA UNIV OXFORD DEPT EXPTL PSYCHOL OXFORD OX1 3UD ENGLAND
出 版 物:《JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA》 (美国声学会志)
年 卷 期:1984年第75卷第4期
页 面:1231-1242页
核心收录:
学科分类:1002[医学-临床医学] 07[理学] 082403[工学-水声工程] 08[工学] 070206[理学-声学] 0824[工学-船舶与海洋工程] 0702[理学-物理学]
基 金:NICHD NIH HHS [HD-01944] Funding Source: Medline NINDS NIH HHS [NS-13545] Funding Source: Medline
主 题:Data analysis Phonetic segments Speech
摘 要:An absolute identification task and various discrimination tasks were performed on synthetic syllables initiated by alveolar stops varying in voice-onset-time (VOT). Signal detection analyses of the data yielded 3 main findings. First, discrimination d s exceeded those for absolute identification. Greater instability of judgment in the latter than in the former task explained this difference. Second, stimuli within a phonetic category were discriminable, even in a delayed 2IAX paradigm with 4 s between stimuli. Third, a category boundary effect appeared: identification and discrimination d s were largest around the voiced/voiceless boundary for alveolar stops. The relationship between discrimination and identification d s varies with response constraints, the number of just noticeable differences in the stimulus array, and stability of judgments in the various tasks. Nearly equal performance in discrimination and identification tasks is not a sufficient condition for a category boundary effect to occur. Several arguments are advanced against a dual-coding model. A continuous model which invokes only a single decision process may account more gracefully for the relationship between identification and discrimination of both consonants and vowels.