Brown Christopher A
Department of Communication Science and Disorders, University of Pittsburgh, Pittsburgh, PA, 15217, United States of America.
PLoS One. 2018 Jan 19;13(1):e0187965. doi: 10.1371/journal.pone.0187965. eCollection 2018.
Although bilateral cochlear implant users receive input to both ears, they nonetheless have relatively poor localization abilities in the horizontal plane. This is likely because of the two binaural cues, they have good sensitivity to interaural differences of level (inter-aural level differences, or ILDs), but not those of time (inter-aural time differences; ITDs). Here, localization performance is assessed in six bilateral cochlear implant patients when instantaneous ITDs are measured and converted to ILDs, a strategy that results in larger-than-typical ILDs. The added ILDs are corrective, in that they are derived from individual listener performance across both frequency and azimuth, so that they are small where a listener performs well, and increase as performance deviates from ideal. Results show significantly improved localization performance as a result of this strategy, with two of the six listeners achieving levels of performance typically observed in NH listeners.
尽管双侧人工耳蜗使用者双耳都能接收输入，但他们在水平面的定位能力相对较差。这可能是由于在两种双耳线索中，他们对耳间声级差（inter-aural level differences，简称ILDs）有良好的敏感度，但对耳间时间差（inter-aural time differences，简称ITDs）却并非如此。在此，对六名双侧人工耳蜗患者进行了定位性能评估，测量了瞬时ITDs并将其转换为ILDs，这一策略会导致产生比正常情况更大的ILDs。增加的ILDs具有校正作用，因为它们是根据个体听众在频率和方位上的表现得出的，所以在听众表现良好的地方ILDs较小，而随着表现偏离理想状态，ILDs会增大。结果表明，由于这一策略，定位性能有了显著提高，六名听众中有两名达到了正常听力（NH）听众通常观察到的性能水平。
