Bestelmeyer Patricia E G, Carey David P
Neuropsychology Research Group, School of Psychology, College of Life Sciences and Medicine, William Guild Building, University of Aberdeen, Old Aberdeen, AB24 2UB Scotland, UK.
Neuropsychologia. 2004;42(9):1162-7. doi: 10.1016/j.neuropsychologia.2004.02.008.
A Posner-like paradigm was employed to investigate the effects of valid and invalid cueing of each hand on reaction time, movement time and peak velocity in an aiming task. Given claims of left hemisphere superiority in movement selection and inhibition (and the privileged within-hemisphere access of the right hand to such systems), it was hypothesised that invalidly cueing the left hand (i.e. right-hand movement precued, left-handed movement required by a go signal) would result in increased reaction time relative to invalid right-hand cueing. The hypothesis was not confirmed as reaction times of both hands were slowed equivalently by invalid cueing. Nevertheless, it was found that the movement duration of the left hand was increased substantially by invalid cueing, while the right hand was unaffected on this measure, suggesting a possible intentional rather than attentional difference between the two hands. These results are discussed in terms of a possible asymmetry of intentional processes related to hand movement and the right-hand advantage in movement duration.
采用一种类似波斯纳的范式来研究在瞄准任务中，每只手的有效和无效线索对反应时间、运动时间和峰值速度的影响。鉴于有观点认为左半球在运动选择和抑制方面具有优势（以及右手在半球内对这类系统具有优先访问权），研究假设，相对于无效提示右手，无效提示左手（即预先提示右手运动，而“开始”信号要求左手运动）会导致反应时间增加。但该假设未得到证实，因为无效提示使两只手的反应时间同等减慢。然而，研究发现，无效提示会使左手的运动持续时间大幅增加，而右手在这一指标上未受影响，这表明两只手之间可能存在意向性差异而非注意力差异。本文从与手部运动相关的意向性过程可能存在的不对称性以及右手在运动持续时间方面的优势等角度对这些结果进行了讨论。
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