Faculty of Health, Medicine, and Life Sciences, Maastricht University, MD, Maastricht, The Netherlands.
Exp Brain Res. 2010 May;203(1):227-32. doi: 10.1007/s00221-010-2214-6. Epub 2010 Mar 19.
Recently, it has been reported that grasping with the left hand is more vulnerable to visual size illusions than grasping with the right hand. The present study investigated whether this increased sensitivity of the left hand for visual context extends to reaching. Left- and right-handed participants reached for targets embedded in two different visual contexts with either left or right hands. Visual context was manipulated by presenting targets either in a blank field or within an array of placeholders marking possible target locations. Regardless of handedness, the presence of placeholders affected left hand, but not right hand, reaching by improving end-point accuracy and reducing movement speed. Furthermore, left hand reaching was more accurate for far than near targets, whereas right hand reaching showed the opposite pattern. We discuss two possible hemispheric lateralization accounts of these findings.
最近有报道称，与右手相比，用左手抓握更容易受到视觉大小错觉的影响。本研究调查了左手对视觉背景的这种敏感性是否会延伸到伸手。左撇子和右撇子参与者用左手或右手伸向嵌入两种不同视觉背景的目标。通过在空白字段或标记可能目标位置的占位符数组中呈现目标来操纵视觉上下文。无论惯用手如何，占位符的存在都会影响左手，但不会影响右手的伸手，从而提高终点准确性并降低运动速度。此外，左手伸手的准确性对于远目标比对近目标更高，而右手伸手则表现出相反的模式。我们讨论了这两种发现的两种可能的半球偏侧化解释。
