Department of Speech, Language, and Hearing Sciences, Purdue University, 500 Oval Drive, West Lafayette, Indiana 47907, USA.
J Acoust Soc Am. 2010 Feb;127(2):EL23-9. doi: 10.1121/1.3280236.
This study investigated temporal integration processes underlying cochlear implant (CI) users' amplitude modulation processing. Thresholds for modulation detection (AMDTs) and modulation frequency discrimination (AMFDTs) were measured for 50-, 100-, and 200-Hz modulation frequencies with stimulus durations from 50 to 400 ms in eight adult CI users. The results showed significant interactions between modulation frequency and stimulus duration for AMDTs and AMFDTs. The data suggest that temporal integration limits CI users' sensitivity to low temporal pitch over short durations, and that temporal integration over longer durations may not enhance CI users' sensitivity to high temporal pitch.
本研究旨在探究人工耳蜗使用者在幅度调制处理方面的耳蜗整合过程。采用 50、100 和 200Hz 的调制频率，对八位成年人工耳蜗使用者进行刺激时长为 50 至 400ms 的调制检测阈值（AMDTs）和调制频率辨别阈值（AMFDTs）的测量。结果表明，AMDTs 和 AMFDTs 中，调制频率与刺激时长之间存在显著的相互作用。数据表明，在短时间内，时间整合限制了人工耳蜗使用者对低时间音高的敏感性，而在长时间内，时间整合可能不会增强人工耳蜗使用者对高时间音高的敏感性。
