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首页> 外文期刊>Experimental Brain Research >Contribution of reference frames for movement planning in peripersonal space representation.
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Contribution of reference frames for movement planning in peripersonal space representation.

机译：参考框架在个人空间表示中用于运动计划的贡献。

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The principal goal of our study is to gain an insight into the representation of peripersonal space. Two different experiments were conducted in this study. In the first experiment, subjects were asked to represent principal anatomical reference planes by drawing ellipses in the sagittal, frontal and horizontal planes. The three-dimensional hand-drawing movements, which were achieved with and without visual guidance, were considered as the expression of a cognitive process per se: the peripersonal space representation for action. We measured errors in the spatial orientation of ellipses with regard to the requested reference planes. For ellipses drawn without visual guidance, with eyes open and eyes closed, orientation errors were related to the reference planes. Errors were minimal for sagittal and maximal for horizontal plane. These disparities in errors were considerably reduced when subjects drew using a visual guide. These findings imply that different planes are centrally represented, and are characterized, by different errors when subjects use a body-centered frame for performing the movement and suggest that the representation of peripersonal space may be anisotropic. However, this representation can be modified when subjects use an environment-centered reference frame to produce the movement. In the second experiment, subjects were instructed to represent, with eyes open and eyes closed, sagittal, frontal and horizontal planes by pointing to virtual targets located in these planes. Disparities in orientation errors measured for pointing were similar to those found for drawing, implying that the sensorimotor representation of reference planes was not constrained by the type of motor tasks. Moreover, arm postures measured at pointing endpoints and at comparable spatial locations in drawing are strongly correlated. These results suggest that similar patterns of errors and arm posture correlation, for drawing and pointing, can be the consequence of using a common space representation and reference frame. These findings are consistent with the assumption of an anisotropic action-related representation of peripersonal space when the movement is performed in a body-centered frame.
机译：我们研究的主要目标是深入了解人际空间的表征。在这项研究中进行了两个不同的实验。在第一个实验中，要求受试者通过在矢状，额状和水平面绘制椭圆形来代表主要的解剖参考平面。在有或没有视觉指导的情况下实现的三维手绘运动，被认为是认知过程本身的表达：动作的人际空间表示。我们根据要求的参考平面测量了椭圆的空间方向误差。对于在没有眼睛指导的情况下画出的椭圆，睁着眼睛闭着眼睛，定向误差与参考平面有关。矢状面的误差最小，水平面的误差最大。当受试者使用目视指南进行画图时，这些误差上的差异被大大减小了。这些发现表明，当受试者使用以身体为中心的框架进行运动时，不同的平面将以不同的错误进行集中表示，并以不同的误差为特征，并暗示人际空间的表示可能是各向异性的。但是，当对象使用以环境为中心的参考系来产生运动时，可以修改此表示。在第二个实验中，受试者被指示通过指向位于这些平面中的虚拟目标，在睁开眼睛和闭眼的情况下代表矢状，额叶和水平面。为指向而测量的定向误差的差异与为绘图所发现的差异相似，这表明参考平面的感觉运动表示不受运动任务类型的限制。此外，在指向端点和图中可比较的空间位置处测得的手臂姿势密切相关。这些结果表明，对于图形绘制和指向，错误模式和手臂姿势相关性的相似模式可能是使用公共空间表示和参考系的结果。这些发现与在以身体为中心的框架中进行运动时，与人际空间的各向异性动作相关的表示相一致。

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