Cortical encoding of pitch contour changes in cochlear implant users: a mismatch negativity study.

Cortical encoding of pitch contour changes in cochlear implant users: a mismatch negativity study.
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DOI:
10.1159/000351802
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发表时间:
2013
影响因子:
1.6
通讯作者:
Fu QJ
Fu QJ
中科院分区:
医学3区
文献类型:
--
作者:
Zhang F;Benson C;Fu QJ

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更好地理解人工耳蜗 (CI) 的旋律音高感知可以指导信号处理和/或康复技术,以提高 CI 患者的音乐感知和欣赏能力。在这项研究中,在 CI 用户和正常听力 (NH) 听众中获得了对五音音调轮廓不频繁变化的失配负性 (MMN) 响应。还测量了旋律轮廓识别(MCI)。结果显示,CI 受试者的 MCI 表现比 NH 受试者差;所有 CI 受试者的 1 半音轮廓均缺失 MMN。与 NH 受试者相比,在 CI 受试者中观察到具有 5 个半音轮廓的 MMN 的比例较小。结果表明,CI 用户对音高轮廓变化的编码似乎有所退化,这很可能是由于 CI 提供的音高线索有限以及与耳聋相关的大脑基质受损所致。
A better understanding of melodic pitch perception in cochlear implants (CIs) may guide signal processing and/or rehabilitation techniques to improve CI patients' music perception and appreciation. In this study, the mismatch negativity (MMN) in response to infrequent changes in five-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 subjects 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 subjects than in 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.
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