Department of Speech-Language-Hearing Sciences, University of Minnesota, Minneapolis, Minnesota 55455, USA.
Department of Psychology, University of Minnesota, 75 East River Road, Minneapolis, Minnesota 55455, USA.
J Acoust Soc Am. 2020 May;147(5):3626. doi: 10.1121/10.0001305.
For cochlear-implant users with near-normal contralateral hearing, a mismatch between the frequency-to-place mapping in the two ears could produce a suboptimal performance. This study assesses tonotopic matches via binaural interactions. Dynamic interaural time-difference sensitivity was measured using bandpass-filtered pulse trains at different rates in the acoustic and implanted ear, creating binaural envelope beats. Sensitivity to beats should peak when the same tonotopic region is stimulated in both ears. All nine participants detected dynamic interaural timing differences and demonstrated some frequency selectivity. This method provides a guide to frequency-to-place mapping without compensation for inherent latency differences between the acoustic and implanted ears.
对于对侧听力接近正常的人工耳蜗使用者来说，两耳间的频率-位置映射不匹配可能导致表现不佳。本研究通过双耳相互作用来评估音位匹配。通过在声学耳和植入耳中以不同速率使用带通滤波脉冲序列产生双耳包络拍频，测量了动态双耳时差敏感性。当双耳刺激相同的音位区域时，拍频敏感性应达到峰值。所有 9 名参与者都能检测到动态双耳时间差异，并表现出一定的频率选择性。这种方法提供了一种无需补偿声学耳和植入耳之间固有潜伏期差异的频率-位置映射指南。
