Asymmetry of evoked potential latency to speech sounds predicts the ear advantage in dichotic listening
Asymmetry of evoked potential latency to speech sounds predicts the ear advantage in dichotic listening
复制标题
DOI：
10.1016/j.cogbrainres.2005.02.017
复制
发表时间：
2005-08-01
期刊：
影响因子：
--
通讯作者：
Hugdahl, K
中科院分区：
文献类型：
--
作者：
Eichele, T;Nordby, H;Hugdahl, K
人类听觉皮层的功能组织仍然没有很好地理解关于言语感知和语言侧化。特别是，有相对较少的数据，在脑成像文献集中在语音处理的时间。我们记录了12名健康志愿者的27个头皮和额外的EOG通道的听觉诱发电位（AEP），这些志愿者执行自由报告的两分性听力任务，使用简单的语音（CV音节：[ba]，[da]，[ga]，[pa]，[ta]，[ka]）。ERP分析采用独立成分分析（伊卡）小波去噪，以减少伪影和提高信噪比。主要的发现是一个15 ms短的平均潜伏期的N1-AEP记录从头皮约覆盖左侧颞上皮质平面相比，在同源的右侧N1-AEP。相应的N1振幅在这些部位之间没有差异。个体AEP潜伏期差异与作为言语/语言偏侧化指标的耳优势显著相关。两半球之间的N1潜伏期的行为相关差异表明，理解言语感知的一个重要关键是考虑神经元事件时序的功能影响。(c)2005 Elsevier B. V.保留所有权利。
The functional organization of the human auditory cortex is still not well understood with respect to speech perception and language lateralization. Especially, there is comparatively little data available in the brain imaging literature focusing on the timing of phonetic processing. We recorded auditory-evoked potentials (AEP) from 27 scalp and additional EOG channels in 12 healthy volunteers performing a free report dichotic, listening task with simple speech sounds (CV syllables: [ba], [da], [ga], [pa], [ta], [ka]). ERP analysis employed independent components analysis (ICA) wavelet denoising for artifact reduction and improvement of the SNR. The main finding was a 15-ms shorter average latency of the N1-AEP recorded from the scalp approximately overlying the left supratemporal cortical plane compared to the N1-AEP over the homologous right side. Corresponding N1 amplitudes did not differ between these sites. The individual AEP latency differences significantly correlated with the ear advantage as an index of speech/language lateralization. The behaviorally relevant difference in N1 latency between the hemispheres indicates that an important key to understanding speech perception is to consider the functional implications of neuronal event timing. (c) 2005 Elsevier B.V. All rights reserved.