School of Kinesiology, Louisiana State University, Baton Rouge, LA, USA.
J Mot Behav. 2021;53(5):622-631. doi: 10.1080/00222895.2020.1817840. Epub 2020 Sep 16.
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.
先前使用眼手耦合和去耦合任务变体的非标准视动转换研究侧重于惯用手的使用。本研究通过纳入非优势手来扩展这项工作。24 名右利手成年人（M=21 岁；12 名女性）在垂直或水平触摸屏上滑动食指，以移动始终显示在垂直平面中的光标。在四个不同的动作感知条件下，手指和光标要么在同一平面和方向上移动，要么在另一个平面和/或相反方向上移动。仅在与运动轨迹相关的变量上，双手的表现存在差异，而与端点相关的测量则没有差异。在所有条件下，使用非优势手时初始方向误差更大（p<0.001）。手×光标方向×光标平面交互作用的显著差异表明，在无眼手解耦或仅一级眼手解耦的条件下，非优势手的运动轨迹比优势手更长，而当运动在具有反转光标方向的水平平面上进行时，手的性能相似，即具有两级眼手解耦。我们的研究结果表明，非优势手在空间规划方面存在整体眼手协调缺陷，与轨迹执行的眼手解耦水平呈负相关。
