Zhang Fawen, Benson Chelsea, Fu Qian-Jie
Department of Communication Sciences and Disorders, University of Cincinnati, Cincinnati, Ohio, USA.
Audiol Neurootol. 2013;18(5):275-88. doi: 10.1159/000351802. Epub 2013 Aug 6.
A better understanding of melodic pitch perception in cochlear implants (CIs) may guide signal processing and/or rehabilitation techniques to improve music perception and appreciation in CI patients. In this study, the mismatch negativity (MMN) in response to infrequent changes in 5-tone pitch contours was obtained in CI users and normal-hearing (NH) listeners. Melodic contour identification (MCI) was also measured. Results showed that MCI performance was poorer in CI than in NH subjects; the MMNs were missing in all CI subjects for the 1-semitone contours. The MMNs with the 5-semitone contours were observed in a smaller proportion of CI than NH subjects. Results suggest that encoding of pitch contour changes in CI users appears to be degraded, most likely due to the limited pitch cues provided by the CI and deafness-related compromise of brain substrates.
更好地理解人工耳蜗（CI）使用者的旋律音高感知，可能会指导信号处理和/或康复技术，以改善CI患者的音乐感知和欣赏能力。在本研究中，对CI使用者和正常听力（NH）听众施加五音音高轮廓的不频繁变化，并记录其失匹配负波（MMN）。同时还测量了旋律轮廓识别（MCI）。结果显示，CI使用者的MCI表现比NH受试者差；所有CI受试者对于1半音轮廓均未出现MMN。与NH受试者相比，CI受试者中观察到5半音轮廓MMN的比例更小。结果表明，CI使用者对音高轮廓变化的编码似乎有所退化，这很可能是由于CI提供的有限音高线索以及与耳聋相关的脑基质损伤所致。
