Separating Predicted and Perceived Sensory Consequences of Motor Learning.
Separating Predicted and Perceived Sensory Consequences of Motor Learning.
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DOI：
10.1371/journal.pone.0163556
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发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Henriques DY
中科院分区：
文献类型：
--
作者：
't Hart BM;Henriques DY
在运动适应过程中，预测和实际感知到的感觉反馈之间的差异被认为是最小的，但对动作的感觉后果的预测可能很难测量。试图这样做的研究发现，自我导向的、看不见的手的位置在改变的视觉反馈的方向上是错误的。然而，我们的实验室已经表明，运动适应也会导致对手位置的感知估计的变化，即使目标手是被动移动的。我们将这些变化归因于手部本体感觉的重新校准，因为在没有意志运动的情况下，传出或预测信号可能不参与。这里的目标是量化手部定位的变化在多大程度上反映了预测的感觉（视觉）结果的变化或感知（本体感受）结果的变化。我们通过比较手部运动自生成（“主动定位”）和机器人生成（“被动定位”）在视觉运动适应旋转光标后产生的相同位置的定位变化来做到这一点。在这个被动版本中，这些机器人产生的手部运动不应该有可预测的后果。我们发现，虽然主动定位任务的定位变化稍大，但被动定位任务也引起了实质性的变化。我们的研究结果表明，视觉运动适应后手部定位的变化可能并不完全基于更新预测的感觉后果，而可能在很大程度上反映了我们本体感觉状态估计的变化。
During motor adaptation the discrepancy between predicted and actually perceived sensory feedback is thought to be minimized, but it can be difficult to measure predictions of the sensory consequences of actions. Studies attempting to do so have found that self-directed, unseen hand position is mislocalized in the direction of altered visual feedback. However, our lab has shown that motor adaptation also leads to changes in perceptual estimates of hand position, even when the target hand is passively displaced. We attribute these changes to a recalibration of hand proprioception, since in the absence of a volitional movement, efferent or predictive signals are likely not involved. The goal here is to quantify the extent to which changes in hand localization reflect a change in the predicted sensory (visual) consequences or a change in the perceived (proprioceptive) consequences. We did this by comparing changes in localization produced when the hand movement was self-generated (‘active localization’) versus robot-generated (‘passive localization’) to the same locations following visuomotor adaptation to a rotated cursor. In this passive version, there should be no predicted consequences of these robot-generated hand movements. We found that although changes in localization were somewhat larger in active localization, the passive localization task also elicited substantial changes. Our results suggest that the change in hand localization following visuomotor adaptation may not be based entirely on updating predicted sensory consequences, but may largely reflect changes in our proprioceptive state estimate.
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