Division of Experimental Otorhinolaryngology, Department of Neurosciences, Katholieke Universiteit Leuven, O & N2, Herestraat 49 bus 721, B-3000 Leuven, Belgium.
J Acoust Soc Am. 2011 Jun;129(6):3457-60. doi: 10.1121/1.3557051.
Sensitivity to interaural time differences (ITDs) with unmodulated low-frequency stimuli was assessed in bimodal listeners who had previously shown to be good performers in ITD experiments. Two types of stimuli were used: (1) an acoustic sinusoid combined with an electric transposed signal and (2) an acoustic sinusoid combined with an electric clicktrain. No or very low sensitivity to ITD was found for these stimuli, even though subjects were highly trained on the task and were intensively tested in multiple test sessions. In previous studies with users of a cochlear implant (CI) and a contralateral hearing aid (HA) (bimodal listeners), sensitivity was shown to ITD with modulated stimuli with frequency content between 600 and 3600 Hz. The outcomes of the current study imply that in speech processing design for users of a CI in combination with a HA on the contralateral side, the emphasis should be more on providing salient envelope ITD cues than on preserving fine-timing ITD cues present in acoustic signals.
对先前在 ITD 实验中表现出色的双耳融合者进行了未调制低频刺激的两耳时间差（ITD）敏感性评估。使用了两种类型的刺激：（1）声正弦波与电转置信号相结合，（2）声正弦波与电 clicktrain 相结合。即使在任务上进行了高度训练并在多个测试会话中进行了密集测试，对于这些刺激也没有或非常低的 ITD 敏感性。在先前使用人工耳蜗（CI）和对侧助听器（HA）的用户（双耳融合者）的研究中，已显示出对具有 600 至 3600 Hz 频率内容的调制刺激的 ITD 敏感性。当前研究的结果表明，在设计用于 CI 与对侧 HA 联合使用的用户的语音处理中，重点应更多地放在提供明显的包络 ITD 线索上，而不是保留声学信号中存在的精细定时 ITD 线索。
