Movement order and saccade direction affect a common measure of eye-hand coordination in bimanual reaching.
Movement order and saccade direction affect a common measure of eye-hand coordination in bimanual reaching.
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DOI：
10.1152/jn.00234.2014
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发表时间：
2014-08
影响因子：
2.5
通讯作者：
E. Mooshagian;Cunguo Wang;Afreen Ferdoash;L. Snyder
中科院分区：
文献类型：
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作者：
E. Mooshagian;Cunguo Wang;Afreen Ferdoash;L. Snyder
对视觉引导下的单手伸臂的研究已经证实，在每次伸臂之前通常会有一次扫视，而且扫视和伸臂的反应时间（RTs）是高度相关的。眼和手RT的相关性通常被认为是眼手协调的一种衡量标准，并被认为有助于手的视觉空间引导。我们询问了在手工到达任务期间会发生什么。与手动触达一样，首先执行的是扫视。虽然在单手试验中潜伏期最快，但无论是单手还是双手到达单一目标，眼睛和手的RT相关性都是相同的。然而，当每只手同时到达不同的目标时，平均相关性显着降低。我们考虑了三个可能解释下降的因素。我们发现，相关强度取决于哪只手先到达，哪只手到达与扫视相同的目标。令人惊讶的是，这两个因素在很大程度上是独立的，而左手或右手的身份几乎没有影响。眼-手的相关性与单手接触的结果相似，只有当移动到与扫视相同目标的手也是第一个移动的手时。因此，时间和空间模式都是决定手眼协调的重要因素。
Studies of visually guided unimanual reaching have established that a saccade usually precedes each reach and that the reaction times (RTs) for the saccade and reach are highly correlated. The correlation of eye and hand RT is commonly taken as a measure of eye-hand coordination and is thought to assist visuospatial guidance of the hand. We asked what happens during a bimanual reach task. As with a unimanual reach, a saccade was executed first. Although latencies were fastest on unimanual trials, eye and hand RT correlation was identical whether just one or both hands reached to a single target. The average correlation was significantly reduced, however, when each hand reached simultaneously to a different target. We considered three factors that might explain the drop. We found that correlation strength depended on which hand reached first and on which hand reached to the same target as the saccade. Surprisingly, these two factors were largely independent, and the identity of the hand, left or right, had little effect. Eye-hand correlation was similar to that seen with unimanual reaching only when the hand that moved to the same target as the saccade was also the first hand to move. Thus both timing as well as spatial pattern are important in determining eye-hand coordination.