Here, we used functional magnetic resonance imaging to investigate the multisensory processing of object shape in the human cerebral cortex and explored the role of mental imagery in such processing. Regions active bilaterally during both visual and haptic shape perception, relative to texture perception in the respective modality, included parts of the superior parietal gyrus, the anterior intraparietal sulcus, and the lateral occipital complex. Of these bimodal regions, the lateral occipital complexes preferred visual over haptic stimuli, whereas the parietal areas preferred haptic over visual stimuli. Whereas most subjects reported little haptic imagery during visual shape perception, experiences of visual imagery during haptic shape perception were common. Across subjects, ratings of the vividness of visual imagery strongly predicted the amount of haptic shape-selective activity in the right, but not in the left, lateral occipital complex. Thus, visual imagery appears to contribute to activation of some, but not all, visual cortical areas during haptic perception.

译文

在这里,我们使用功能磁共振成像研究了人大脑皮层中物体形状的多感觉处理,并探讨了心理图像在这种处理中的作用。相对于各自形态中的纹理感知,在视觉和触觉形状感知过程中双侧活跃的区域包括上顶回的部分,前顶骨沟和枕骨外侧复合体。在这些双峰区域中,枕骨外侧复合体比触觉刺激更喜欢视觉,而顶叶区域比触觉刺激更喜欢触觉。尽管大多数受试者在视觉形状感知过程中报告的触觉图像很少,但在触觉形状感知过程中视觉图像的体验很常见。在整个受试者中,视觉图像的生动性等级强烈预测了右侧枕骨外侧复合体中触觉形状选择活动的数量,而左侧枕骨外侧复合体则没有。因此,视觉图像似乎有助于触觉感知过程中某些 (但不是全部) 视觉皮层区域的激活。

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