Hill Nicholas I, Bailey Peter J
Department of Psychology, University of York, York YO10 5DD, UK.
Perception. 2002;31(11):1395-402. doi: 10.1068/p3124.
The aim of the study was to examine the effects of differences in temporal gating and ear of presentation (both separately and in combination) on listeners' ability to detect an increment in the level of a 1 kHz component (the target) relative to that of four spectrally flanking components. The flanking components were always presented to the listeners' right ear, while the target component was either presented to the same ear (monaural presentation) or to the left ear (dichotic presentation). Similarly, the target and flanking components were either gated on and off at the same time (synchronous presentation), or else the target component began 100 ms before and terminated 100 ms after the four flanking components (asynchronous presentation). On average, thresholds were lowest in the synchronous, monaural condition, and highest in the two asynchronous conditions. Ear differences alone did result in elevated thresholds for most listeners. However, combining differences in gating and ear of presentation produced thresholds that were indistinguishable from those obtained when gating differences alone were employed. These results are consistent with the suggestion that differences in temporal gating lead to more complete segregation of concurrent frequency components than differences in spatial location.
本研究的目的是考察时间选通和声音呈现耳朵的差异（单独以及组合起来）对听众检测1kHz成分（目标音）相对于四个频谱旁侧成分的电平增量能力的影响。旁侧成分总是呈现给听众的右耳，而目标成分要么呈现给同一只耳朵（单耳呈现），要么呈现给左耳（双耳分听呈现）。同样，目标成分和旁侧成分要么同时开启和关闭（同步呈现），要么目标成分在四个旁侧成分之前100毫秒开始并在之后100毫秒结束（异步呈现）。平均而言，在同步单耳条件下阈值最低，在两种异步条件下阈值最高。仅耳朵差异确实导致大多数听众的阈值升高。然而，将选通差异和声音呈现耳朵的差异结合起来产生的阈值与仅采用选通差异时获得的阈值没有区别。这些结果与以下观点一致，即时间选通差异比空间位置差异导致同时出现的频率成分更完全的分离。
