Adaptive changes in automatic motor responses based on acquired visuomotor correspondence.
Adaptive changes in automatic motor responses based on acquired visuomotor correspondence.
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基于获得的视觉运动对应性的自动运动反应的自适应变化。
DOI：
10.1007/s00221-018-5409-x
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发表时间：
2019
影响因子：
2
通讯作者：
Itaguchi Y. and Fukuzawa K.
中科院分区：
文献类型：
--
作者：
Takahiro Osumi;Koki Tsuji;Midori Shibata;Satoshi Umeda;Itaguchi Y. and Fukuzawa K.
本研究测试了视觉运动对应的重新映射是否会改变视觉刺激引起的自动运动反应。我们假设，一致性效应是一种基于刺激-反应一致性的运动反应的自动调节，它根据通过适应任务获得的新的视觉运动对应而变化。为了诱导视觉运动适应，参与者在视觉反馈旋转30°或150°的情况下执行跟踪任务。在参与者向左或向右移动手指的视觉反应任务中，一致性效应被评估了多次。我们预测，作为自动反应的衡量标准，一致性效应在适应150°旋转后几乎会被逆转，因为与参与者自身动作空间相反的视觉刺激在150°旋转环境中会成为“一致”刺激，而在30°旋转环境中则不会。结果表明，视运动对150°旋转的适应确实根据获得的视运动对应调节了一致性效应，但并没有完全逆转一致性效应。当操作后评估效果时，假设将内部模型切换回正常状态，自动运动反应没有变化。此外，我们发现后效应随着训练的进行而发展，但随着时间的推移而减弱。这些发现表明，在运动反应中服务于自动调节的视觉运动系统是基于当前活跃的内部模型，因此具有高度的适应性。此外，从内部模型的切换函数的角度讨论了视觉运动任务后效的机制。
The present study tested whether remapping of visuomotor correspondence alters automatic motor responses induced by visual stimuli. We hypothesized that the congruency effect, an automatic modulation of motor responses based on stimulus–response congruency, changes in accordance with a new visuomotor correspondence acquired through an adaptation task. To induce visuomotor adaptation, participants performed a tracking task with 30° or 150° rotation of the visual feedback. The congruency effect was evaluated multiple times by a visual response task where participants moved their finger left or right. We predicted that the congruency effect, as a measure of automatic responses, would be almost reversed after adaptation to the 150° rotation, because a visual stimulus spatially opposite to the participant’s own action would become a “congruent” stimulus in a 150°-rotated environment but not in a 30°-rotation environment. The results show that visuomotor adaptation to the 150° rotation did modulate the congruency effect in accordance with the acquired visuomotor correspondence, but did not completely reverse the effect. When the effect was assessed after the manipulation, which was assumed to switch an internal model back to its normal state, there was no change in automatic motor responses. Furthermore, we found that after effects developed as the training proceeded but decreased over time. These findings suggest that the visuomotor system subserving automatic modulation in motor responses is based on the currently active internal model and, therefore, highly adaptive. In addition, the mechanism underlying after effects in a visuomotor task is discussed in terms of a switching function of internal models.