Feredoes Eva A, Sachdev Perminder S
School of Psychiatry, Faculty of Medicine, University of New South Wales, Sydney, Australia.
Cortex. 2006 Jul;42(5):750-4. doi: 10.1016/s0010-9452(08)70413-1.
A recently published study used the interference strategy of transcranial magnetic stimulation (TMS) to demonstrate the role of the right posterior parietal cortex (PPC) in the mental rotation of alphanumeric stimuli. We used similar stimulation parameters over the same left and right PPC regions, and examined the ability to rotate more complex 3D Shepard and Metzler (1971) images. There was reduced accuracy of performance with both right and left PPC stimulation for different angles of rotation of the visual stimuli. Right PPC stimulation led to reduced accuracy to rotate stimuli by 1200, whereas left PPC stimulation affected 180 degrees C rotation. We hypothesise that the two hemispheres make different contributions to the processing underlying visuospatial mental imagery: the right PPC is important for spatial rotations through smaller angles; the left hemisphere has a unique role when the stimuli to be compared are rotated through 180 degrees C, a task that engages verbal strategies due to the well-documented special nature of enantiomorphs.
最近发表的一项研究采用经颅磁刺激（TMS）干扰策略，以证明右侧顶叶后皮质（PPC）在字母数字刺激的心理旋转中的作用。我们在相同的左右PPC区域使用了相似的刺激参数，并研究了旋转更复杂的3D谢泼德和梅茨勒（1971年）图像的能力。对于视觉刺激的不同旋转角度，右侧和左侧PPC刺激均导致表现准确性降低。右侧PPC刺激导致将刺激旋转120°时准确性降低，而左侧PPC刺激影响180°旋转。我们假设，两个半球对视觉空间心理意象的基础加工有不同贡献：右侧PPC对于较小角度的空间旋转很重要；当要比较的刺激旋转180°时，左半球具有独特作用，由于镜像具有充分记录的特殊性质，此任务涉及言语策略。
