Effector movement triggers gaze-dependent spatial coding of tactile and proprioceptive-tactile reach targets
Effector movement triggers gaze-dependent spatial coding of tactile and proprioceptive-tactile reach targets
复制标题
效应器运动触发触觉和本体触觉到达目标的依赖于凝视的空间编码
DOI：
10.1016/j.neuropsychologia.2014.07.025
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发表时间：
2014
期刊：
影响因子：
2.6
通讯作者：
K. Fiehler
中科院分区：
文献类型：
--
作者：
S. Mueller;K. Fiehler
在空间中伸手需要目标和手在同一坐标系中表示。虽然视觉引导的研究一致表明，使用一个凝视依赖的空间参考框架，有争议的结果存在于躯体感觉域。我们调查了目标呈现后和到达之前的效应器运动（眼睛或手臂/手）是否会导致体感目标的凝视依赖性编码。受试者到达一个感觉到的目标，同时将目光投向七个固定位置之一。将触摸施加到左手的指尖（本体感觉触觉目标）或左前臂的背侧表面（触觉目标）。效应器运动在目标肢体的运动或注视转移方面是不同的。水平到达误差系统地变化的功能时，无论是目标效应器或凝视的运动被引入的凝视。然而，我们发现没有影响的凝视水平达到错误时，运动是缺席之前达到。这些发现对于触觉和本体感觉触觉目标是相当的。我们的研究结果表明，效应器运动促进开关从凝视独立的凝视依赖的代表性的体感达到目标。
Reaching in space requires that the target and the hand are represented in the same coordinate system. While studies on visually-guided reaching consistently demonstrate the use of a gaze-dependent spatial reference frame, controversial results exist in the somatosensory domain. We investigated whether effector movement (eye or arm/hand) after target presentation and before reaching leads to gaze-dependent coding of somatosensory targets. Subjects reached to a felt target while directing gaze towards one of seven fixation locations. Touches were applied to the fingertip(s) of the left hand (proprioceptive-tactile targets) or to the dorsal surface of the left forearm (tactile targets). Effector movement was varied in terms of movement of the target limb or a gaze shift. Horizontal reach errors systematically varied as a function of gaze when a movement of either the target effector or gaze was introduced. However, we found no effect of gaze on horizontal reach errors when a movement was absent before the reach. These findings were comparable for tactile and proprioceptive-tactile targets. Our results suggest that effector movement promotes a switch from a gaze-independent to a gaze-dependent representation of somatosensory reach targets.