Miller Kirsty A, Smyth Mary M
School of Psychology, University of Lincoln, Lincoln, UK.
Q J Exp Psychol (Hove). 2012;65(10):1911-26. doi: 10.1080/17470218.2012.669389. Epub 2012 Apr 18.
The bimanual coupling literature supposes an inherent drive for synchrony between the upper limbs when making discrete bimanual movements. The level of synchrony is argued to be task dependent, reliant on the visual demands of the two targets, and the result of a complex pattern of hand and eye movements (Bingham, Hughes, & Mon-Williams, 2008 ; Riek, Tresilian, Mon-Williams, Coppard, & Carson, 2003). However, recent work by Bruyn and Mason (2009) suggests that temporal coordination is not solely influenced by visual saccades. In this experimental series, a total of 8 participants performed congruent movements to targets either near or far from the midline. Targets far from the midline, requiring a visual saccade, resulted in greater terminal asynchrony. Initial and terminal asynchrony were not consistent, but linked to the task demands at that stage of the movement. If the asynchrony evident at the end of a bimanual movement is due to a complex pattern of hand and eye movements then the removal of visual feedback should result in an increase in synchrony. Sixteen participants then completed congruent and incongruent bimanual aiming movements to near and/or far targets. Movements were made with or without visual feedback of hands and targets. Analyses revealed that movements made without visual feedback showed increased synchrony between the limbs, yet movements to incongruent targets still showed greater asynchrony. We suggest that visual constraints are not the sole cause of asynchrony in discrete bimanual movements.
双手协调文献认为，在进行离散的双手动作时，上肢之间存在内在的同步驱动。同步程度被认为取决于任务，依赖于两个目标的视觉需求，以及复杂的手眼运动模式的结果（宾厄姆、休斯和蒙-威廉姆斯，2008年；里克、特雷西利安、蒙-威廉姆斯、科帕德和卡森，2003年）。然而，布鲁因和梅森（2009年）最近的研究表明，时间协调并非仅受视觉扫视的影响。在这个实验系列中，共有8名参与者对靠近或远离中线的目标进行了一致的动作。远离中线的目标需要视觉扫视，导致更大的末端异步性。初始和末端异步性并不一致，但与动作该阶段的任务需求有关。如果双手动作结束时明显的异步性是由于复杂的手眼运动模式，那么去除视觉反馈应该会导致同步性增加。然后，16名参与者对靠近和/或远离的目标完成了一致和不一致的双手瞄准动作。动作在有或没有手和目标的视觉反馈的情况下进行。分析表明，没有视觉反馈的动作显示出肢体之间的同步性增加，但对不一致目标的动作仍然显示出更大的异步性。我们认为，视觉限制不是离散双手动作中异步性的唯一原因。
