Sittiprapaporn Wichian, Tervaniemi Mari, Chindaduangratn Chittin, Kotchabhakdi Naiphinich
Neuro-Behavioural Biology Center, Institute of Science and Technology for Research and Development, Mahidol University, Salaya, Nakhonpathom, Thailand.
Neuroreport. 2005 Sep 8;16(13):1513-8. doi: 10.1097/01.wnr.0000175618.46677.07.
Event-related potentials to infrequently presented spoken deviant syllables /pi/ and /po/ among repetitive standard [see text] syllables were recorded in Thai study participants who ignored these stimuli while reading books of their choices. The vowel across-category and within-category changes elicited a change-specific mismatch negativity response. The across-category and within-category change discrimination of vowels in consonant-vowel syllable was also assessed using the low-resolution electromagnetic tomography. The results of low-resolution electromagnetic tomography mismatch negativity generator analysis suggest that the within-category change perception of vowels is analyzed as the change in physical features of the stimuli, thus predominantly activating the right temporal cortex. In contrast, the left temporal cortex is predominantly activated in the across-category change perception of vowels, emphasizing the role of the left hemisphere in speech processing already at a preattentive processing level also in consonant-vowel syllables. The results support the hypothesis that a part of the superior temporal gyrus contains neurons specialized for speech perception.
在泰国研究参与者阅读自选书籍并忽略这些刺激时，记录了他们对重复标准[见文本]音节中偶尔出现的异常语音音节/pi/和/po/的事件相关电位。元音的跨类别和类别内变化引发了特定变化的失匹配负波反应。还使用低分辨率电磁断层扫描评估了辅音 - 元音音节中元音的跨类别和类别内变化辨别。低分辨率电磁断层扫描失匹配负波发生器分析结果表明，元音的类别内变化感知被分析为刺激物理特征的变化，从而主要激活右侧颞叶皮层。相比之下，在元音的跨类别变化感知中，左侧颞叶皮层被主要激活，这强调了左半球在辅音 - 元音音节的预注意处理水平上对语音处理的作用。这些结果支持了这样的假设，即颞上回的一部分包含专门用于语音感知的神经元。
