Effect of visual and haptic feedback on grasping movements
Effect of visual and haptic feedback on grasping movements
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DOI：
10.1152/jn.00439.2014
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发表时间：
2014-12-15
影响因子：
2.5
通讯作者：
Domini, Fulvio
中科院分区：
文献类型：
--
作者：
Bozzacchi, Chiara;Volcic, Robert;Domini, Fulvio
对三维（3D）属性（诸如对象的距离和深度）的感知估计通常是不准确的。考虑到我们拾取物体的准确性和容易性，可以预期感知失真不会影响大脑如何处理3D信息以实现抓取运动。然而，实证结果表明，抓取精度降低时，手的视觉反馈被删除。在这里，我们研究了特定类型的训练是否可以纠正抓握行为，即使没有任何形式的反馈也能充分发挥作用。使用块设计范例，我们记录了运动学的主题抓住虚拟物体位于不同的距离，在没有视觉反馈的手和触觉反馈的对象，之前和之后的不同的训练块与不同的反馈组合（视觉的拇指和视觉的拇指和食指，有和没有触觉反馈的对象）。在预训练块中，我们发现了终端手的位置，最终的抓地力孔径和最大抓地力孔径的系统性偏差，就像感知任务中报告的那样。重要的是，物体呈现的距离调节了所有这些偏差。在训练后的模块中，只有手的位置被部分调整，但最终和最大的抓地力孔径保持不变。这些研究结果表明，当视觉和触觉反馈是缺乏系统的失真的3D估计影响达到把握运动，以同样的方式，因为它们影响感知估计。最重要的是，即使经过大量的反馈培训，准确性也是无法学习的。
Perceptual estimates of three-dimensional (3D) properties, such as the distance and depth of an object, are often inaccurate. Given the accuracy and ease with which we pick up objects, it may be expected that perceptual distortions do not affect how the brain processes 3D information for reach-to-grasp movements. Nonetheless, empirical results show that grasping accuracy is reduced when visual feedback of the hand is removed. Here we studied whether specific types of training could correct grasping behavior to perform adequately even when any form of feedback is absent. Using a block design paradigm, we recorded the movement kinematics of subjects grasping virtual objects located at different distances in the absence of visual feedback of the hand and haptic feedback of the object, before and after different training blocks with different feedback combinations (vision of the thumb and vision of thumb and index finger, with and without tactile feedback of the object). In the Pretraining block, we found systematic biases of the terminal hand position, the final grip aperture, and the maximum grip aperture like those reported in perceptual tasks. Importantly, the distance at which the object was presented modulated all these biases. In the Posttraining blocks only the hand position was partially adjusted, but final and maximum grip apertures remained unchanged. These findings show that when visual and haptic feedback are absent systematic distortions of 3D estimates affect reach-to-grasp movements in the same way as they affect perceptual estimates. Most importantly, accuracy cannot be learned, even after extensive training with feedback.