Illusions of force perception: The role of sensori-motor predictions, visual information, and motor errors
Illusions of force perception: The role of sensori-motor predictions, visual information, and motor errors
复制标题
DOI：
10.1152/jn.01076.2006
复制
发表时间：
2007-05-01
影响因子：
2.5
通讯作者：
Ivry, Richard B.
中科院分区：
文献类型：
--
作者：
Diedrichsen, Joern;Verstynen, Timothy;Ivry, Richard B.
内部预测影响力的感知。当我们用一只手支撑一个物体，用另一只手举起它时，我们希望第一只手的力消失。在一个虚拟现实系统中，我们违反了这一预测，通过保持对姿势手的力，而物体仍然被看到并感觉到被举起的手举起。在这种情况下，参与者感觉到一种错觉，在力量上的姿势的手，这是，在现实中，恒定的。我们测试了三种可能的机制，如何在这种情况下，力的感知可能会受到影响。首先，我们证明了部分错觉可以与感觉运动预测相联系，即基于举起动作的传出副本预测的感觉结果。当物体被外力举起时，这种错觉就会减少。我们还发现，错觉的变化是在一次又一次的试验基础上进行的，与姿势反应的快速适应相平行。第二，由前向模型校准错误引起的运动错误不会导致错觉;即使我们通过支持姿势手来防止运动错误，错觉也没有改变。最后，表示物体被移走的视觉信息足以引起部分错觉。这些结果表明，感觉运动的预测和视觉对象的信息，而不是运动错误，影响力的知觉。
Internal predictions influence the perception of force. When we support an object with one hand and lift it up with the other, we expect the force to disappear from the first, postural hand. In a virtual reality system, we violated this prediction by maintaining the force on the postural hand, whereas the object was still seen and felt to be lifted by the lifting hand. In this situation, participants perceived an illusionary increase in force on the postural hand, which was, in reality, constant. We test three possible mechanisms of how force perception may be influenced in this context. First, we showed that part of the illusion can be linked to a sensorimotor prediction-the predicted sensory consequences based on an efference copy of the lifting action. The illusion is reduced when the object is lifted by an external force. We also showed that the illusion changes on a trial-by-trial basis, paralleling the fast adaptation of the postural response. Second, motor errors that arise from a miscalibrated forward model do not contribute to the illusion; the illusion was unchanged even when we prevented motor errors by supporting the postural hand. Finally, visual information signaling the removal of the object is sufficient to elicit part of the illusion. These results argue that both sensorimotor predictions and visual object information, but not motor errors, influence force perception.