Duration discrimination of speech and tonal complex stimuli by normally hearing and hearing-impaired listeners.
Duration discrimination of speech and tonal complex stimuli by normally hearing and hearing-impaired listeners.
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听力正常和听力受损的听众对语音和音调复杂刺激的持续时间辨别。
DOI：
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发表时间：
1988
影响因子：
2.4
通讯作者：
D. MacKenzie
中科院分区：
文献类型：
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作者：
J. Bochner;K. Snell;D. MacKenzie
在三个正常听力和七个严重听力受损的听众中，研究了元音和音调复合体（填充间隔）的长度变化和在终止辅音和音调复合体（未填充间隔）的间隙的持续时间的辨别能力。语音刺激由元音（i，I，u，U，a，A）和辅音（p，t，k）组成，音调复合体由0.5，1和2 kHz的数字生成的正弦曲线组成。每个听众组的会话水平的信号，和3IFC自适应程序被用来估计差阈（DL）。在充满和未充满的条件下，语音的DL与音调复合刺激的DL相似。听力正常和受损的听众表现出更大的敏锐性，在填充的时间比未填充的间隔的变化。从听力正常的听众获得的填充间隔的平均阈值小于从听力受损的听众。然而，对于未填充的音程，不同听者组之间的差异并不显著。一些听力受损的听众表现出的时间敏锐度相比，正常听力的听众几个听条件。这些结果的影响进行了讨论，在正常和听力受损的个人的言语知觉。
The ability to discriminate changes in the length of vowels and tonal complexes (filled intervals) and in the duration of closure in stop consonants and gaps in tonal complexes (unfilled intervals) was studied in three normally hearing and seven severely hearing-impaired listeners. The speech stimuli consisted of the vowels (i, I, u, U, a, A) and the consonants (p, t, k), and the tonal complexes consisted of digitally generated sinusoids at 0.5, 1, and 2 kHz. The signals were presented at conversational levels for each listener group, and a 3IFC adaptive procedure was used to estimate difference limens (DLs). The DLs for speech were similar to those for tonal complex stimuli in both the filled and unfilled conditions. Both normally and impaired-hearing listeners demonstrated greater acuity for changes in the duration of filled than unfilled intervals. Mean thresholds for filled intervals obtained from normally hearing listeners were smaller than those obtained from hearing-impaired listeners. For unfilled intervals, however, the difference between listener groups was not significant. A few hearing-impaired listeners demonstrated temporal acuity comparable to that of normally hearing listeners for several listening conditions. Implications of these results are discussed with regard to speech perception in normally and impaired-hearing individuals.