Visual guidance of arm reaching: Online adjustments of movement direction are impaired by amplitude control
Visual guidance of arm reaching: Online adjustments of movement direction are impaired by amplitude control
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DOI：
10.1167/10.5.24
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发表时间：
2010-01-01
影响因子：
1.8
通讯作者：
Blouin, Jean
中科院分区：
文献类型：
--
作者：
Sarlegna, Fabrice R.;Blouin, Jean
大多数伸展臂运动具有幅度和方向约束。在这里，我们研究了这些运动参数在视觉控制方面的相互依赖性。为了做到这一点，我们要求成年人看向目标并伸手去够，在第一个实验中，必须控制运动的幅度和方向。随机地，手部视觉反馈在手臂运动开始附近改变以影响运动方向、运动幅度或两者。由于视觉变化发生在眼扫视，他们没有意识到。快速到达的运动（平均持续时间= 334 ms）轻微的视觉变化（约15%和8%的运动方向和幅度的视觉调整，分别）的影响。此外，方向调整根据幅度调整而变化（反之亦然）。因此，在第二个实验中，我们研究了放松控制运动幅度的要求的效果。要求参与者只控制运动方向导致了大量的方向调整（49%）的基础上转移手的视觉反馈。总体而言，这些研究结果表明，运动幅度的控制限制了运动方向的在线调整，并且控制运动幅度和方向的机制不是独立的。
Most reaching arm movements have amplitude and direction constraints. Here we investigated the interdependence of these movement parameters in terms of visual control. To do so, we asked human adults to look and reach toward targets such that, in a first experiment, both movement amplitude and direction had to be controlled. Randomly, hand visual feedback was shifted near arm movement onset to influence movement direction, movement amplitude or both. Because the visual shifts occurred during ocular saccades, they were not consciously perceived. The rapid reaching movements (mean duration = 334 ms) were slightly influenced by the visual shifts (approximately 15% and 8% of visual adjustment for movement direction and amplitude, respectively). Moreover, directional adjustments varied according to amplitude adjustments (and vice-versa). We thus examined, in a second experiment, the effect of relaxing the requirement to control movement amplitude. Asking participants to control only movement direction led to substantial directional adjustments (49%) based on shifted hand visual feedback. Overall, these findings indicate that the control of movement amplitude constrains the online adjustments of movement direction and that the mechanisms controlling movement amplitude and direction are not independent.