Natural prehension in trials without haptic feedback but only when calibration is allowed
Natural prehension in trials without haptic feedback but only when calibration is allowed
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DOI：
10.1016/j.neuropsychologia.2006.07.011
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发表时间：
2007-01-01
期刊：
影响因子：
2.6
通讯作者：
Mon-Williams, Mark
中科院分区：
文献类型：
--
作者：
Bingham, Geoffrey;Coats, Rachel;Mon-Williams, Mark
伸手抓握动作通常是准确、精确和刻板的动作模式。当触觉反馈在“虚拟现实”系统中被移除时，或者当参与者做手势模仿时，这些功能就会消失。[古德特，M.一、雅各布森湖美国，Keillor，J. M.（1994年）。手势与自然抓握动作的视觉控制差异。Neuropsychologia，32，1159-1178]认为，哑剧的延伸是不自然的形式，因为腹侧流，而不是背侧流调解他们。我们测试了校准是否可以防止“不自然”的干扰。校准是指使用错误（视觉和/或动觉）信号来改善性能。我们要求参与者在四种情况下进行伸手抓握：（A）基线;（13）有触觉反馈的伸手抓握（视觉开环对物理对象的扩展）;（C）没有反馈（视觉开环对可以看到但感觉不到的对象的扩展）;（D）（B）和（C）的随机混合。使用45度的镜子来显示物体，而不会降低视觉质量。在条件（C）中观察到正常的性能下降，但在条件（D）中随机嵌入反馈试验的相同试验中没有观察到。这些研究结果表明，参与者可以产生正常的视觉开环扩展时，触觉反馈的情况下，校准是允许的。因此，当允许校准时，背流处理可以支持哑剧达到。(c)2006爱思唯尔有限公司保留所有权利。
Reach-to-grasp (prehension) movements are normally accurate, precise and stereotypical in movement pattern. These features disappear when haptic feedback is removed in 'virtual reality' systems or when participants pantomime prehension. [Goodate, M. A., Jakobsen, L. S., Keillor, J. M. (1994). Differences in the visual control of pantomimed and natural grasping movements. Neuropsychologia, 32, 1159-1178] suggested that pantomimed reaches are unnatural in form because the ventral rather than the dorsal stream mediates them. We tested whether calibration can prevent 'unnatural' prehension. Calibration refers to the use of an error (visual and/or kinaesthetic) signal to refine performance. We asked participants to reach-and-grasp in four conditions: (A) baseline; (13) reaching-to-grasp with haptic feedback (visual open-loop prehension to a physical object); (C) no feedback (visual-open-loop prehension to an object that could be seen but not felt); (D) a random mixture of (B) and (C). A 45 degrees mirror was used to display objects without any reduction in visual quality. The normal decrements in performance were observed in condition (C) but not in the identical trials randomly embedded with feedback trials in condition (D). These findings show that participants can produce normal visual-open-loop prehension in the absence of haptic feedback when calibration is allowed. Thus, dorsal stream processing can support pantomimed reaching when calibration is allowed. (c) 2006 Elsevier Ltd. All rights reserved.