Shtyrov Y, Kujala T, Ilmoniemi R J, Näätänen R
Department of Psychology, University of Helsinki, Finland.
Neuroreport. 1999 Jul 13;10(10):2189-92. doi: 10.1097/00001756-199907130-00034.
This study explored the effects of acoustic noise on the cerebral asymmetry of speech perception. We measured magnetic fields of the brain elicited by consonant-vowel syllables in silence and white noise. Background noise affected brain responses to these stimuli differently in the left and right auditory cortices. Its depressive effect on cortical responses was found mainly in the left hemisphere, whereas the right hemisphere was unaffected or exhibited increased activity in noise. Locations of the P1, N1, and P2 activity sources in noise were different from those in silence in the right but not in the left hemisphere. These results suggest an increased right hemisphere role in speech sound processing in noisy conditions, involving the recruitment of additional right auditory cortex structures.
本研究探讨了噪声对言语感知脑不对称性的影响。我们测量了在安静和白噪声环境中由辅音 - 元音音节诱发的脑磁场。背景噪声对左右听觉皮层中这些刺激的脑反应影响不同。其对皮层反应的抑制作用主要在左半球被发现，而右半球未受影响或在噪声环境中表现出活动增加。在噪声环境中，P1、N1和P2活动源的位置在右半球与安静环境中不同，但在左半球则没有差异。这些结果表明，在嘈杂环境中，右半球在语音处理中的作用增强，这涉及到额外的右听觉皮层结构的参与。
