顶后皮质中扫视的相对位置码。

A relative position code for saccades in dorsal premotor cortex.

机构信息

Center for Neural Science, New York University, New York, New York 10003, USA.

出版信息

J Neurosci. 2010 May 12;30(19):6527-37. doi: 10.1523/JNEUROSCI.1625-09.2010.

Abstract

Spatial computations underlying the coordination of the hand and eye present formidable geometric challenges. One way for the nervous system to simplify these computations is to directly encode the relative position of the hand and the center of gaze. Neurons in the dorsal premotor cortex (PMd), which is critical for the guidance of arm-reaching movements, encode the relative position of the hand, gaze, and goal of reaching movements. This suggests that PMd can coordinate reaching movements with eye movements. Here, we examine saccade-related signals in PMd to determine whether they also point to a role for PMd in coordinating visual-motor behavior. We first compared the activity of a population of PMd neurons with a population of parietal reach region (PRR) neurons. During center-out reaching and saccade tasks, PMd neurons responded more strongly before saccades than PRR neurons, and PMd contained a larger proportion of exclusively saccade-tuned cells than PRR. During a saccade relative position-coding task, PMd neurons encoded saccade targets in a relative position code that depended on the relative position of gaze, the hand, and the goal of a saccadic eye movement. This relative position code for saccades is similar to the way that PMd neurons encode reach targets. We propose that eye movement and eye position signals in PMd do not drive eye movements, but rather provide spatial information that links the control of eye and arm movements to support coordinated visual-motor behavior.

摘要

手眼协调的空间计算提出了艰巨的几何挑战。神经系统简化这些计算的一种方法是直接编码手和注视中心的相对位置。在手臂伸展运动的指导中至关重要的背侧运动前皮层 (PMd) 中的神经元编码手、注视和到达运动目标的相对位置。这表明 PMd 可以协调与眼球运动相关的到达运动。在这里,我们检查 PMd 中的扫视相关信号,以确定它们是否也表明 PMd 在协调视觉运动行为方面的作用。我们首先比较了 PMd 神经元群体和顶叶到达区域 (PRR) 神经元群体的活动。在中心外出和扫视任务中,PMd 神经元在扫视之前的反应比 PRR 神经元更强,并且 PMd 中包含更大比例的专门用于扫视调谐的细胞比 PRR 多。在扫视相对位置编码任务中,PMd 神经元以依赖于注视、手和扫视眼运动目标的相对位置的相对位置编码来编码扫视目标。这种扫视的相对位置编码类似于 PMd 神经元编码到达目标的方式。我们提出,PMd 中的眼球运动和眼球位置信号不会驱动眼球运动,而是提供空间信息,将眼和手臂运动的控制联系起来,以支持协调的视觉运动行为。

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