Prather S C, Votaw John R, Sathian K
Department of Neurology, Emory University School of Medicine, WMRB 6000, 1639 Pierce Drive, Atlanta, GA 30322, USA.
Neuropsychologia. 2004;42(8):1079-87. doi: 10.1016/j.neuropsychologia.2003.12.013.
Many studies have found that visual cortical areas are active during tactile perception. Here we used positron emission tomographic (PET) scanning in normally sighted humans to show that extrastriate cortical regions are recruited in a task-specific manner during perceptual processing of tactile stimuli varying in two dimensions. Mental rotation of tactile Forms activated a focus around the anterior part of the left intraparietal sulcus. Since prior studies have reported activity nearby during mental rotation of visual stimuli, this focus appears to be associated with the dorsal visual (visuospatial) pathway. Discrimination between tactile Forms activated the right lateral occipital complex, an object-selective region in the ventral visual (visual Form) pathway. Thus, tactile tasks appear to recruit cortical regions that are active during corresponding visual tasks. Activation of these areas in both visual and tactile tasks could reflect visual imagery during tactile perception, activity in multisensory representations, or both.
许多研究发现，视觉皮层区域在触觉感知过程中是活跃的。在此，我们对正常视力的人类进行正电子发射断层扫描（PET），以表明在对二维变化的触觉刺激进行感知处理期间，纹外皮层区域是以任务特异性方式被募集的。触觉图形的心理旋转激活了左顶内沟前部周围的一个焦点。由于先前的研究报告在视觉刺激的心理旋转期间附近区域有活动，这个焦点似乎与背侧视觉（视觉空间）通路相关。触觉图形之间的辨别激活了右侧枕叶外侧复合体，这是腹侧视觉（视觉图形）通路中的一个物体选择性区域。因此，触觉任务似乎会募集在相应视觉任务期间活跃的皮层区域。在视觉和触觉任务中这些区域的激活可能反映了触觉感知期间的视觉表象、多感觉表征中的活动，或两者皆有。
