Abstract

Various factors (e.g., hand preference, object properties) constrain reach-to-grasp in hemispace. With object use, end-state comfort (ESC) has been shown to supersede the preferential use of one hand at the midline. To assess how location, size, and orientation of objects (dowel, mallet, cup) influence preferred-hand use and ESC (N = 50; M_age = 20.83), three preferential reaching tasks were implemented. Object location influenced hand selection in all tasks, along with size (cups) and orientation (mallets). Object location and orientation influenced ESC, but only with dowels and mallets. When oriented away from the preferred hand in hemispace, there was a higher occurrence of non-preferred hand use to facilitate ESC. Overall, findings add to understanding of ESC and preferential reaching with varying task demands.

摘要

各种因素（例如，手部偏好、物体属性）限制了半空间中的抓取。使用物体时，终态舒适度 (ESC) 已被证明可以取代优先使用一只手在中线。评估物体（木钉、木槌、杯子）的位置、大小和方向如何影响首选手使用和 ESC（N = 50；M_年龄= 20.83)，实施了三个优先到达任务。对象位置影响所有任务中的手选择，以及大小（杯子）和方向（槌）。物体位置和方向会影响 ESC，但仅限于销钉和木槌。当在半空间中远离首选手时，非首选手使用的发生率更高，以促进 ESC。总的来说，研究结果增加了对 ESC 的理解，以及对不同任务需求的优先到达。