Internalizing agency of self-action: Perception of one's own hand movements depends on an adaptable prediction about the sensory action outcome
Internalizing agency of self-action: Perception of one's own hand movements depends on an adaptable prediction about the sensory action outcome
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DOI：
10.1152/jn.00104.2006
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发表时间：
2006-09-01
影响因子：
2.5
通讯作者：
Lindner, Axel
中科院分区：
文献类型：
--
作者：
Synofzik, Matthis;Thier, Peter;Lindner, Axel
对伸手和指向任务的学习的广泛研究表明，我们优化目标导向的运动行为的能力具有高度的可塑性。然而，关注运动适应过程中我们自身行为的感知意识的研究仍然很少。在这里，我们首次同时研究两个层面的感觉运动适应，即动作和动作感知。我们假设自我行动感知依赖于对感觉行动结果的内部预测，这些预测以类似于运动控制的方式更新。二十名人类受试者进行了前后指向动作，并通过视觉反馈。反馈最初以相对于实际手指位置的时空对应形式呈现，但后来以恒定角度旋转。当重复应用扭曲的反馈时，受试者感知的指向方向会向轨迹旋转的方向移动。在没有视觉反馈的对照试验中观察到了类似的知觉重新解释，这表明受试者学会了根据非视觉的内部信息来预测其行为的新视觉结果。然而，对世界的看法却没有改变。对自身运动感知的变化伴随着相同量的运动性能的适应性变化，即与所施加的视觉旋转方向相反的次级运动补偿。我们的结果表明，对自己行为的感知取决于对感官行为结果的适应性内部预测，使我们能够将我们行为的新感官后果归因于我们自己的机构。此外，他们表明更新的感官预测可用于优化运动控制。
Extensive work on learning in reaching and pointing tasks has demonstrated high degrees of plasticity in our ability to optimize goal-directed motor behavior. However, studies focusing on the perceptual awareness of our own actions during motor adaptation are still rare. Here we present the first simultaneous investigation of sensorimotor adaptation on both levels, i.e., action and action perception. We hypothesized that self-action perception relies on internal predictions about the sensory action outcome that are updated in a way similar to that of motor control. Twenty human subjects performed out-and-back pointing movements that were fed back visually. Feedback was initially presented in spatiotemporal correspondence with respect to the actual finger position, but later rotated by a constant angle. When distorted feedback was applied repetitively, subjects' perceived pointing direction shifted in the direction of the trajectory rotation. A comparable perceptual reinterpretation was observed in control trials without visual feedback, indicating that subjects learned to predict the new visual outcome of their actions based on nonvisual, internal information. The perception of the world, however, remained unchanged. The changes in perception of one's own movements were accompanied by adaptive changes in motor performance of the same amount, i.e., a secondary motor compensation opposite to the direction of the imposed visual rotation. Our results show that the perception of one's own actions depends on adaptable internal predictions about the sensory action outcome, allowing us to attribute new sensory consequences of our actions to our own agency. Furthermore, they indicate that the updated sensory prediction can be used to optimize motor control.