Prismatic displacement of vision induces transient changes in the timing of eye-hand coordination
Prismatic displacement of vision induces transient changes in the timing of eye-hand coordination
复制标题
视觉的棱镜位移引起眼手协调时间的短暂变化
DOI：
10.3758/bf03205270
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
T. Mano
中科院分区：
文献类型：
--
作者：
Y. Rossetti;K. Koga;T. Mano
在手指指向通过楔形棱镜看到的视觉目标的任务过程中，眼手协调进行了研究。在对照条件下和棱镜曝光结束时，手和眼的活动时间和运动时间相同。在适应过程中观察到眼和手运动的时间重组。在棱镜曝光的早期阶段，眼睛扫视的结束和手运动的开始之间的时间间隔从23毫秒的控制时间增加到68毫秒。这表明在早期棱镜曝光期间发生了一个耗时的过程。这个时间间隔的演变与棱镜曝光的早期阶段的指向错误的演变，在这样一种方式，这两个措施增加在棱镜曝光的发病和下降几乎回到控制值在约10个试验。然而，空间误差并没有完全纠正，即使在棱镜曝光后期，眼睛和手的时间组织已经恢复到基线。这些数据表明，两种不同的适应机制在工作：一个相当短期的机制，参与正常的协调空间对齐的眼睛和手系统，和一个长期的机制，负责重新映射空间失调的系统。前一种机制可以战略性地用于在涉及未对准的情况下快速优化精度，但完全自适应的行为必须等待作用较慢的后一种机制来实现长期的空间对准。
Eye-hand coordination was investigated during a task of finger pointing toward visual targets viewed through wedge prisms. Hand and eye latencies and movement times were identical during the control condition and at the end of prism exposure. A temporal reorganization of eye and hand movements was observed during the course of adaptation. During the earlier stage of prism exposure, the time gap between the end of the eye saccade and the onset of hand movement was increased from a control time of 23 to 68 msec. This suggests that a time-consuming process occurred during the early prism-exposure period. The evolution of this time gap was correlated with the evolution of pointing errors during the early stage of prism exposure, in such a way that both measures increased at the onset of prism exposure and decreased almost back to control values within about 10 trials. However, spatial error was not entirely corrected, even late in prism exposure when the temporal organization of eye and hand had returned to baseline. These data suggest that two different adaptive mechanisms were at work: a rather short-term mechanism, involved in normal coordination of spatially aligned eye and hand systems, and a long-term mechanism, responsible for remapping spatially misaligned systems. The former mechanism can be strategically employed to quickly optimize accuracy in a situation involving misalignment, but completely adaptive behavior must await the slower-acting latter mechanism to achieve longterm spatial alignment.