Alho K, Connolly J F, Cheour M, Lehtokoski A, Huotilainen M, Virtanen J, Aulanko R, Ilmoniemi R J
Department of Psychology, University of Helsinki, Finland.
Neurosci Lett. 1998 Dec 11;258(1):9-12. doi: 10.1016/s0304-3940(98)00836-2.
Event-related magnetoencephalographic (MEG) responses to infrequently presented spoken deviant syllables [di] and [ba] among repetitive standard [da)]syllables were recorded in subjects who either attended to these stimuli in order to discriminate the [ba] syllables or ignored them while attending a silent movie. In both conditions, the deviant syllables elicited a mismatch response (MMNm, the magnetic counterpart of mismatch negativity), which was stronger in the left than in the right auditory cortex, indicating left-hemispheric dominance in speech processing already at a preattentive processing level.
在重复呈现标准音节[da]的过程中，向受试者记录与事件相关的脑磁图（MEG）反应，这些受试者要么专注于这些刺激以辨别[ba]音节，要么在观看无声电影时忽略它们。在这两种情况下，异常音节都会引发失配反应（MMNm，失配负波的磁对应物），该反应在左听觉皮层比右听觉皮层更强，表明在注意力前加工水平上，左半球在言语加工中占主导地位。
