Abstract

Previous nonstandard visuomotor transformation studies using variations of eye-hand coupling and decoupling tasks focused on dominant hand use. The present study expanded this work by including the non-dominant hand. Twenty-four right-hand dominant adults (M = 21 yrs.; 12 females) slid their index finger along a vertical or horizontal touchscreen to move a cursor that was always displayed in the vertical plane. In four different action-perception conditions, the finger and cursor moved either in the same plane and direction or in the other plane and/or opposite direction. Performance differed between the hands only for movement trajectory related variables but not for endpoint related measures. Across conditions the initial direction error was larger when performing with the non-dominant hand (p < 0.001). A significant hand × cursor direction × cursor plane interaction for path length (p < 0.05) revealed longer movement trajectories for the non-dominant hand compared to the dominant hand in conditions with none or one level of eye-hand decoupling, and similar hand performance when movements were made in the horizontal plane with reversed cursor direction, i.e., two eye-hand decoupling levels. Our findings suggest a non-dominant hand overall eye-hand coordination deficit for spatial planning and an inversely related deficit to the eye-hand decoupling level for trajectory execution.

摘要

以前使用眼手耦合和解耦任务的变化进行非标准视觉运动转换研究，重点是优势手的使用。本研究通过包括非惯用手来扩展这项工作。24 名惯用右手的成年人（M = 21 岁；12 名女性）沿垂直或水平触摸屏滑动食指以移动始终显示在垂直平面上的光标。在四种不同的动作感知条件下，手指和光标在同一平面和方向上移动，或者在另一个平面和/或相反方向上移动。双手之间的表现仅在运动轨迹相关变量方面有所不同，而在终点相关措施方面则没有。在不同条件下，使用非惯用手执行时初始方向误差更大（p < 0.001）。路径长度（p < 0.05）的显着手×光标方向×光标平面交互显示，在没有或一级眼手解耦和类似手部表现的情况下，与惯用手相比，非惯用手具有更长的运动轨迹当在水平平面上以相反的光标方向进行移动时，即两个眼手解耦级别。我们的研究结果表明，空间规划的非优势手整体眼手协调缺陷和轨迹执行的眼手解耦水平负相关缺陷。当在水平平面上以相反的光标方向进行移动时，也就是类似的手部性能，即两个眼手解耦级别。我们的研究结果表明，空间规划的非惯用手整体眼手协调不足，而与轨迹执行的眼手解耦水平呈负相关。当在水平平面上以相反的光标方向进行移动时，也就是类似的手部性能，即两个眼手解耦级别。我们的研究结果表明，空间规划的非优势手整体眼手协调缺陷和轨迹执行的眼手解耦水平负相关缺陷。