Harinen Kirsi, Rinne Teemu
Institute of Behavioural Sciences, University of Helsinki, Finland.
Institute of Behavioural Sciences, University of Helsinki, Finland; Advanced Magnetic Imaging Centre, Aalto University School of Science, Finland.
Brain Lang. 2014 Nov;138:71-9. doi: 10.1016/j.bandl.2014.09.006. Epub 2014 Oct 11.
The present study compared activations to prototype, nonprototype, nonphonemic, and cross-category vowel pairs during vowel discrimination, category discrimination, 2-back, and visual tasks. Our results support previous findings that areas of the superior temporal gyrus (STG) are sensitive to the speech-level difference between prototype vs. nonprototype and phonemic vs. nonphonemic vowels. Further, consistent with previous studies, we found enhanced activations in anterior-posterior STG and inferior parietal lobule (IPL) during the vowel discrimination and 2-back tasks, respectively. Unlike the vowel discrimination task, the category discrimination task was associated with strong IPL activations. Our results provide evidence that activations in STG and IPL strongly depend on whether the task requires analysis of detailed acoustical information or operations on categorical representations. Based on previous studies investigating activations during categorical pitch and spatial tasks, we argue that this distinction is probably not specific to speech.
本研究比较了在元音辨别、类别辨别、2-back任务和视觉任务中，对原型、非原型、非音素和跨类别元音对的激活情况。我们的结果支持了之前的研究发现，即颞上回（STG）区域对原型与非原型以及音素与非音素元音之间的语音水平差异敏感。此外，与之前的研究一致，我们分别发现在元音辨别任务和2-back任务期间，前后STG和顶下小叶（IPL）的激活增强。与元音辨别任务不同，类别辨别任务与强烈的IPL激活相关。我们的结果提供了证据，表明STG和IPL中的激活强烈依赖于任务是需要分析详细的声学信息还是对类别表征进行操作。基于之前对类别音高和空间任务期间激活情况的研究，我们认为这种区别可能并非语音所特有。
