The removal of binocular cues disrupts the calibration of grasping in patients with visual form agnosia
The removal of binocular cues disrupts the calibration of grasping in patients with visual form agnosia
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双眼线索的去除会扰乱视觉形式失认症患者的抓握校准
DOI：
10.1007/pl00005731
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发表时间：
1997
影响因子：
2
通讯作者：
M. Goodale
中科院分区：
文献类型：
--
作者：
J. Marotta;M. Behrmann;M. Goodale
摘要本研究验证了这样一种观点，即调节视觉记忆的视觉系统并不独立地获得由知觉机制处理的图像线索。 与视觉形式失认症，其知觉系统受到损害，但谁有完整的视觉控制，个人进行了检查，以确定他们是否可以使用图片场景线索，以校准手动视时，双目信息被删除。双目线索的删除产生了相当大的破坏的大小恒定的抓地力孔径，这与早期的观察在正常受试者相结合，表明双目线索是最重要的校准把握。在没有双眼视觉的情况下，正常受试者可以使用图像信息来计算目标物体的距离（以及大小），而图像信息在视觉形式失认症患者中严重受损。因此，具有视觉形式失认症的个体必须依赖于保持未校准的视网膜图像，导致抓握孔径的不准确校准。事实上，这些人缩放他们的把握不太准确的单眼观看条件下，尽管表现出正常的双眼抓握，表明图像线索的深度，这可能是由调解我们的感知对象和世界上的事件的机制处理，可以访问视觉机制只能间接。这些结果，连同其他人，表明视觉系统“更喜欢”使用双目信息和使用图片线索只有作为最后的手段。
Abstract The present study tested the idea that the visuomotor systems mediating prehension do not have independent access to pictorial cues processed by perceptual mechanisms. Individuals with visual form agnosia, whose perceptual systems are compromised but who have intact visuomotor control, were examined to determine whether they could use pictorial scene cues to calibrate manual prehension when binocular information was removed. The removal of binocular cues produced considerable disruptions in size-constancy of grip aperture, which, combined with earlier observations in normal subjects, suggests that binocular cues are of primary importance in calibration of grasping. In the absence of binocular vision, normal subjects can use pictorial information, information that is severely compromised in individuals with visual form agnosia, to compute the distance (and thus the size) of the goal object. Thus, individuals with visual form agnosia must rely on a retinal image that remains uncalibrated, leading to inaccurate calibrations of grip aperture. The fact that these individuals scaled their grasp much less accurately under the monocular viewing condition, despite showing normal binocular grasping, suggests that pictorial cues to depth, which are presumably processed by mechanisms mediating our perception of objects and events in the world, can be accessed by visuomotor mechanisms only indirectly. These results, together with others, suggest that the visuomotor system ’prefers’ to use binocular information and uses pictorial cues only as a last resort.
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DOI：
10.1037//0894-4105.11.1.30
发表时间：
1997
期刊：
Neuropsychology.
影响因子：
--
作者：
Vecera,SP;Behrmann,M
通讯作者：
Behrmann,M