Bochner J H, Snell K B, MacKenzie D J
National Technical Institute for the Deaf, Rochester Institute of Technology, New York 14623.
J Acoust Soc Am. 1988 Aug;84(2):493-500. doi: 10.1121/1.396827.
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.
研究了3名听力正常的听众和7名重度听力受损的听众辨别元音和声调组合（填充音程）长度变化以及塞音中闭塞时长和声调组合中缺口（未填充音程）时长变化的能力。语音刺激包括元音（i、I、u、U、a、A）和辅音（p、t、k），声调组合由0.5千赫、1千赫和2千赫的数字生成正弦波组成。针对每个听众组，信号以对话水平呈现，并采用3IFC自适应程序来估计差别阈限（DLs）。在填充和未填充条件下，语音的DLs与声调组合刺激的DLs相似。听力正常和听力受损的听众在填充音程时长变化方面都表现出比未填充音程更高的敏锐度。听力正常的听众获得的填充音程平均阈限小于听力受损的听众。然而，对于未填充音程，听众组之间的差异并不显著。一些听力受损的听众在几种聆听条件下表现出与听力正常的听众相当的时间敏锐度。讨论了这些结果对听力正常和听力受损个体语音感知的影响。
