Buus S, Scharf B, Florentine M
J Acoust Soc Am. 1984 Jul;76(1):77-86. doi: 10.1121/1.391010.
The onset-time difference delta T required to lateralize a 30-ms bifrequency tone burst toward the leading ear was measured as a function of the frequency difference delta F between the tone in the left ear and the tone in the right ear. At center frequencies of 0.5 and 4 kHz, four normal listeners tested at 80 and 100 dB SPL had delta Ts that were relatively constant at subcritical delta Fs, but increased at delta Fs wider than a critical band. At 1 kHz, delta T increased with delta F even at subcritical delta Fs. Ten listeners with cochlear impairments were tested at 100 dB SPL. Seven had normal delta Ts at 4 kHz, despite hearing losses between 50 and 70 dB. At 0.5 and 1 kHz, mildly impaired listeners had nearly normal lateralization functions, whereas more severely imparied listeners had very large delta Ts and no frequency selectivity. These and other findings indicate that listeners even with moderate to severe hearing losses can lateralize normally on the basis of interaural differences in onset envelope, but not on the basis of temporal differences in the fine structure.
将30毫秒双频音爆偏向主导耳所需的起始时间差ΔT，被测量为左耳和右耳音调之间频率差ΔF的函数。在0.5和4千赫兹的中心频率下，在80和100分贝声压级测试的四名正常听众，其ΔT在亚临界ΔF时相对恒定，但在比临界带宽更宽的ΔF时增加。在1千赫兹时，即使在亚临界ΔF时，ΔT也随ΔF增加。在100分贝声压级对十名有耳蜗损伤的听众进行了测试。七名听众在4千赫兹时具有正常的ΔT，尽管听力损失在50至70分贝之间。在0.5和1千赫兹时，轻度受损的听众具有近乎正常的定位功能，而受损更严重的听众具有非常大的ΔT且没有频率选择性。这些以及其他发现表明，即使是中度至重度听力损失的听众，也可以根据起始包络的双耳差异正常定位，但不能根据精细结构中的时间差异进行定位。
