Large-field visual motion directly induces an involuntary rapid manual following response
Large-field visual motion directly induces an involuntary rapid manual following response
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DOI：
10.1523/jneurosci.4143-04.2005
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发表时间：
2005-05-18
影响因子：
5.3
通讯作者：
Gomi, H
中科院分区：
文献类型：
--
作者：
Saijo, N;Murakami, I;Gomi, H
最近的神经科学研究一直关注目标运动是如何在目标定位的基础上产生的。然而，来自周围环境以及来自目标的视觉信息可以以与姿势和眼睛运动控制中的已知效应类似的方式影响手臂运动控制。在这里，我们展示了一个超快的手动运动反应直接引起的大视野的视觉运动。当受试者在视觉运动的方向上移动他的手时，这种快速反应辅助反应，这表明在姿势运动期间辅助视觉诱发手动控制。产生这种反应的肌肉活动的潜伏期与视觉运动的眼跟随反应的潜伏期一样短。突然的视觉运动引起手臂运动而不影响知觉目标定位，视觉刺激的运动连贯性和速度的程度调制这个手臂的反应。当视觉运动被限制在击球运动的“后续”阶段时，这种视觉行为仍然被观察到，其中没有目标存在。对手臂动作的分析表明，受试者所做的击球后续动作不是伸展动作的一部分。此外，手臂的反应系统调制的手偏置力，这表明它是从一个反射性的控制机制。因此，我们建议，它的机制是从根本上不同的运动控制有针对性的运动到一个目标。相反，在与反射性眼球运动稳定视网膜图像的类比中，我们认为这种机制与自主运动控制平行地调节手臂运动。
Recent neuroscience studies have been concerned with how aimed movements are generated on the basis of target localization. However, visual information from the surroundings as well as from the target can influence arm motor control, in a manner similar to known effects in postural and ocular motor control. Here, we show an ultra-fast manual motor response directly induced by a large-field visual motion. This rapid response aided reaction when the subject moved his hand in the direction of visual motion, suggesting assistive visually evoked manual control during postural movement. The latency of muscle activity generating this response was as short as that of the ocular following responses to the visual motion. Abrupt visual motion entrained arm movement without affecting perceptual target localization, and the degrees of motion coherence and speed of the visual stimulus modulated this arm response. This visuomotor behavior was still observed when the visual motion was confined to the "follow- through" phase of a hitting movement, in which no target existed. An analysis of the arm movements suggests that the hitting follow through made by the subject is not a part of a reaching movement. Moreover, the arm response was systematically modulated by hand bias forces, suggesting that it results from a reflexive control mechanism. We therefore propose that its mechanism is radically distinct from motor control for aimed movements to a target. Rather, in an analogy with reflexive eye movement stabilizing a retinal image, we consider that this mechanism regulates arm movements in parallel with voluntary motor control.