The use of head/eye-centered, hand-centered and allocentric representations for visually guided hand movements and perceptual judgments
The use of head/eye-centered, hand-centered and allocentric representations for visually guided hand movements and perceptual judgments
复制标题
使用以头/眼为中心、以手为中心和非中心表示来进行视觉引导的手部运动和感知判断
DOI：
10.1016/j.neuropsychologia.2008.12.039
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发表时间：
2009
期刊：
影响因子：
2.6
通讯作者：
J. Todd
中科院分区：
文献类型：
--
作者：
L. Thaler;J. Todd
据报道，有两个实验旨在测量两种视觉引导手部运动的准确性和可靠性(实验。1)和知觉匹配判断(实验2)。通知受试者每次试验所需反应的特定程序被操纵，使得一些任务只能使用视觉目标的向心表示来执行；其他任务可以使用向心或手中心表示来执行；还有一些任务可以基于分配中心、手中心或头/眼中心表示来执行。头部/眼睛和手为中心的表征都是以自我为中心的，因为它们指定了相对于主体的视觉坐标。结果表明，当受试者将他们的反应指向一个可见的目标位置时，运动反应和知觉反应的准确性和可靠性都最高，这使得他们能够依赖于目标在以头/眼为中心的坐标中的表征。当受试者不能将他们的反应指向可见的目标位置，而必须用手中心或分配中心的视觉坐标来表示目标距离和方向时，可以观察到反应的平均和标准差的系统变化。受试者的运动和知觉表现在数量上是一致的。这些结果有力地表明，受试者处理以头/眼为中心的表征不同于以手为中心或以分配为中心的表征，但他们共同处理运动动作和知觉判断的视觉信息。
Two experiments are reported that were designed to measure the accuracy and reliability of both visually guided hand movements (Exp. 1) and perceptual matching judgments (Exp. 2). The specific procedure for informing subjects of the required response on each trial was manipulated so that some tasks could only be performed using an allocentric representation of the visual target; others could be performed using either an allocentric or hand-centered representation; still others could be performed based on an allocentric, hand-centered or head/eye-centered representation. Both head/eye and hand centered representations are egocentric because they specify visual coordinates with respect to the subject. The results reveal that accuracy and reliability of both motor and perceptual responses are highest when subjects direct their response towards a visible target location, which allows them to rely on a representation of the target in head/eye-centered coordinates. Systematic changes in averages and standard deviations of responses are observed when subjects cannot direct their response towards a visible target location, but have to represent target distance and direction in either hand-centered or allocentric visual coordinates instead. Subjects’ motor and perceptual performance agree quantitatively well. These results strongly suggest that subjects process head/eye-centered representations differently from hand-centered or allocentric representations, but that they process visual information for motor actions and perceptual judgments together.