Crapse Trinity B, Sommer Marc A
Department of Neuroscience, A210 Langley Hall, Center for the Neural Basis of Cognition, and Center for Neuroscience at the University of Pittsburgh, University of Pittsburgh, Pittsburgh, PA 15260, USA.
Curr Opin Neurobiol. 2008 Dec;18(6):552-7. doi: 10.1016/j.conb.2008.09.017. Epub 2008 Nov 6.
Movements are necessary to engage the world, but every movement results in sensorimotor ambiguity. Self-movements cause changes to sensory inflow as well as changes in the positions of objects relative to motor effectors (eyes and limbs). Hence the brain needs to monitor self-movements, and one way this is accomplished is by routing copies of movement commands to appropriate structures. These signals, known as corollary discharge (CD), enable compensation for sensory consequences of movement and preemptive updating of spatial representations. Such operations occur with a speed and accuracy that implies a reliance on prediction. Here we review recent CD studies and find that they arrive at a shared conclusion: CD contributes to prediction for the sake of sensorimotor harmony.
运动对于与外界互动是必要的，但每一个动作都会导致感觉运动的模糊性。自身运动不仅会引起感觉输入的变化，还会导致物体相对于运动效应器（眼睛和四肢）位置的改变。因此，大脑需要监测自身运动，实现这一点的一种方式是将运动指令的副本发送到适当的结构。这些信号被称为伴随放电（CD），能够补偿运动的感觉后果，并对空间表征进行抢先更新。这些操作的速度和准确性表明其依赖于预测。在这里，我们回顾了最近关于伴随放电的研究，发现它们得出了一个共同的结论：伴随放电有助于实现感觉运动协调的预测。
