Szymanski M D, Yund E W, Woods D L
Department of Neurology, University of California, Davis, VA Northern California System of Clinics, Martinez 94553, USA.
Neuroreport. 1999 May 14;10(7):1605-8. doi: 10.1097/00001756-199905140-00039.
The effects of auditory selective attention on event related potentials (ERPs) to speech sounds were examined in subjects attending to vowel-consonant-vowels (VCVs) in one ear while ignoring VCVs in the opposite ear. In one condition, subjects discriminated phonetic changes in the VC, CV, or both formant-transition regions. In another condition, they discriminated equally difficult intensity changes in the same VCV regions. Attention-related negative difference waves showed enhanced early and late components (Nde and Ndl) during phoneme-discrimination conditions. Hemispheric asymmetries developed only during the Ndl and were more pronounced during phoneme discrimination. The results suggest that auditory areas of both hemispheres are specialized for phonetic analysis, with hemispherically specialized mechanisms engaged primarily during the final stages of phoneme processing.
在受试者中，研究了听觉选择性注意对语音事件相关电位（ERP）的影响。受试者一只耳朵注意听元音 - 辅音 - 元音（VCV），同时忽略另一只耳朵中的VCV。在一种情况下，受试者辨别VC、CV或两个共振峰过渡区域中的语音变化。在另一种情况下，他们辨别相同VCV区域中难度相同的强度变化。在音素辨别条件下，与注意相关的负向差异波显示出早期和晚期成分（Nde和Ndl）增强。半球不对称仅在Ndl期间出现，并且在音素辨别期间更为明显。结果表明，两个半球的听觉区域专门用于语音分析，半球特异性机制主要在音素处理的最后阶段起作用。
