Monocular vision leads to a dissociation between grip force and grip aperture scaling during reach-to-grasp movements
Monocular vision leads to a dissociation between grip force and grip aperture scaling during reach-to-grasp movements
复制标题
DOI：
10.1016/s0960-9822(01)00682-0
复制
发表时间：
2002-02-05
期刊：
影响因子：
9.2
通讯作者：
Shaw, A
中科院分区：
文献类型：
--
作者：
Jackson, SR;Newport, R;Shaw, A
有人认为，视觉感知和视觉行动控制取决于功能上不同且解剖学上可分离的大脑系统[1-3]。电生理学 [4] 证据表明，双眼视觉对于后顶叶皮质内的视觉运动处理尤其重要，神经心理学 [5, 6] 和心理物理学 [7-11] 研究证实，双眼视觉对于准确规划和控制抓握运动至关重要。一个未解决的问题涉及消除双眼视觉的视觉运动处理的后果。一种解释是，单眼观看会导致依赖图片视觉线索来校准抓握 16]，并导致正常尺寸恒定机制的破坏 [6, 7]。该提议基于这样的发现：单眼视觉会减小最大抓握孔径。根据第二种说法，单眼观看会导致双眼视觉线索的丧失，并通过改变安全裕度导致视觉传感器处理的策略性变化[9-11]。该提议基于这样的发现：最大抓握孔径随着单眼视觉的增加而增加。我们测量了双目和单眼观察执行的抓握运动期间的抓握孔径和抓握力。我们证明上述每个帐户都可能是正确的并且可以在同一任务中观察到。具体来说，我们表明，虽然握持孔径随着单眼视觉的增加而增加，这与视觉传感器安全裕度的改变一致，但最大握力却减小了，这与对物体尺寸的误解一致。这些结果与校准握力孔径和伸手过程中握力所需的视觉处理差异有关。
It has been argued that visual perception and the visual control of action depend upon functionally distinct and anatomically separable brain systems [1-3]. Electrophysiological [4] evidence indicates that binocular vision may be particularly important for the visuornotor processing within the posterior parietal cortex, and neuropsychological [5, 6] and psychophysical [7-11] studies confirm that binocular vision is crucial for the accurate planning and control of prehension movements. An unresolved issue concerns the consequences for visuornotor processing of removing binocular vision. By one account, monocular viewing leads to reliance upon pictorial visual cues to calibrate grasping 16] and results in disruption to normal size-constancy mechanisms [6, 7]. This proposal is based on the finding that maximum grip apertures are reduced with monocular vision. By a second account, monocular viewing results in the loss of binocular visual cues and leads to strategic changes in visuornotor processing by way of altered safety margins [9-11]. This proposal is based on the finding that maximum grip apertures are increased with monocular vision. We measured both grip aperture and grip force during prehension movements executed with binocular and monocular viewing. We demonstrate that each of the above accounts may be correct and can be observed within the same task. Specifically, we show that, while grip apertures increase with monocular vision, consistent with altered visuornotor safety margins, maximum grip force is nevertheless reduced, consistent with a misperception of object size. These results are related to differences in visual processing required for calibrating grip aperture and grip force during reaching.