Motor cortical activity during drawing movements: population representation during lemniscate tracing.
Motor cortical activity during drawing movements: population representation during lemniscate tracing.
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绘画运动期间的运动皮层活动：双纽带追踪期间的群体代表性。
DOI：
10.1152/jn.1999.82.5.2705
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
Moran,DW
中科院分区：
文献类型：
--
作者：
Schwartz,AB;Moran,DW
当猴子用食指在触摸式电脑显示器上画数字8时，运动和运动前区皮层的单细胞的细胞外活动被记录下来。每个单元单独记录，并从四个半球（3个初级运动和1个背侧前运动）收集的反应作为一个群体进行分析。从这个活动中构建的人口矢量准确和同构地表示所绘制的图形的形状，表明它们很好地表示了任务的空间方面。这些观察结果进行了扩展，通过检查这个神经代表和手指位移之间的时间关系。在这项任务中产生的运动是在四个运动部分。这种分割在人口矢量的时间序列中是明显的。此外，描述人类绘画的幂律在猴手轨迹的神经关联中也很明显。在任务期间，移动方向和速度不断变化。在每一段中，速度和方向都在不断变化。种群矢量和运动方向之间的预测间隔在曲率高的段的中间增加，但在每个段的开始和结束处的直线部分减少。与方向相反，运动速度和种群矢量长度之间的预测区间几乎是恒定的，在每个段中只有适度的调制。填充向量在整个绘图任务中预测方向（向量角度）和速度（向量长度）。关节角速度和手臂肌肉肌电图与手的方向有很好的相关性，这表明运动学和动力学参数在这些任务中是相关的。
Activity was recorded extracellularly from single cells in motor and premotor cortex as monkeys traced figure-eights on a touch-sensitive computer monitor using the index finger. Each unit was recorded individually, and the responses collected from four hemispheres (3 primary motor and 1 dorsal premotor) were analyzed as a population. Population vectors constructed from this activity accurately and isomorphically represented the shape of the drawn figures showing that they represent the spatial aspect of the task well. These observations were extended by examining the temporal relation between this neural representation and finger displacement. Movements generated during this task were made in four kinematic segments. This segmentation was clearly evident in a time series of population vectors. In addition, thepower law described for human drawing was also evident in the neural correlate of the monkey hand trajectory. Movement direction and speed changed continuously during the task. Within each segment, speed and direction changed reciprocally. The prediction interval between the population vector and movement direction increased in the middle of the segments where curvature was high, but decreased in straight portions at the beginning and end of each segment. In contrast to direction, prediction intervals between the movement speed and population vector length were near-constant with only a modest modulation in each segment. Population vectors predicted direction (vector angle) and speed (vector length) throughout the drawing task. Joint angular velocity and arm muscle EMG were well correlated to hand direction, suggesting that kinematic and kinetic parameters are correlated in these tasks.