No Dissociation between Perception and Action in Patient DF When Haptic Feedback is Withdrawn
No Dissociation between Perception and Action in Patient DF When Haptic Feedback is Withdrawn
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DOI：
10.1523/jneurosci.3413-11.2012
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发表时间：
2012-02-08
影响因子：
5.3
通讯作者：
Schenk, Thomas
中科院分区：
文献类型：
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作者：
Schenk, Thomas
Goodale等人（1991）报告了感知和行动的视觉之间的显著分离。他们检查了DF，一个腹侧视觉流受损的人类患者，患有视觉形式失认症。她无法感知物体的大小，但可以在抓取过程中将手的张开与物体的大小相匹配。得出的结论是，抓依赖于一个单独的代表性的视觉大小在背流，并不需要从腹流的视觉输入。这一观察启发了有影响力的感知动作模型，该模型声称感知和动作是独立的视觉流。然而，在抓取（而不是在相应的感知任务），参与者每次试验后收到触觉反馈。利用这种反馈，DF可能会弥补她受损的尺寸视觉。我重新检查DF的抓取行为，使用镜像装置将物体的图像与其物理存在分离。DF的抓握只有在她接受触觉反馈时才是正常的。因此，在抓取时，DF可以依靠触觉反馈来弥补她在尺寸感知方面的缺陷。这可以解释为什么她的抓握明显优于她的知觉表现。研究结果强调了早期流间相互作用的程度，并强调了背流感觉处理的多模态性质。
Goodale et al. (1991) reported a striking dissociation between vision for perception and action. They examined DF, a human patient who had damage to her ventral visual stream and suffered from visual form agnosia. She was unable to perceive an object's size but could match the opening of her hand to the object's size during grasping. It was concluded that grasping relied on a separate representation of visual size in the dorsal stream and required no visual input from the ventral stream. This observation inspired the influential perception action model, which claimed separate visual streams for perception and action. However, in grasping (but not in corresponding perceptual tasks), participants receive haptic feedback after each trial. Using this feedback, DF might compensate for her impaired size-vision. I reexamined DF's grasping behavior using a mirror apparatus to dissociate the image of an object from its physical presence. DF's grasping was only normal when she received haptic feedback. Thus, in grasping, DF can rely on haptic feedback to compensate for her deficit in size-perception. This can explain why her grasping is significantly better than her perceptual performance. The findings emphasize the extent of early interstream interactions and highlight the multimodal nature of sensory processing in the dorsal stream.