Hamada I, Kubota K
Brain Res Bull. 1979 Mar-Apr;4(2):249-57. doi: 10.1016/0361-9230(79)90289-2.
During a single-step visual tracking task of monkeys, parametric changes of the wrist extension-flexion movement and related discharge rate changes of pyramidal tract neurons (PTNs) of hand-arm motor area were studied. The task consisted of preparatory, precontraction, contraction and target periods. If the displacement amplitude was changed from narrow (10-20 degrees) to moderate (40 degrees) range, peak velocity, peak acceleration and contraction period increased linearly but precontraction period decreased slightly. In 61 movement-related PTNs, no linear relationships were found between PTN discharge rate during precontraction or contraction period and displacement amplitude, velocity, acceleration, precontraction period or contraction period. In less than 20% of PTNs, however, correlations between PTN discharge rate during precontraction period and velocity or acceleration were found in the moderate range task. It occurred less frequently in narrow range task. It is said in a visual tracking task that PTN activity is not dependent upon factors related to the task parameters, such as velocity, acceleration. Possible related factors were discussed.
在猴子的单步视觉跟踪任务中，研究了手腕屈伸运动的参数变化以及手臂运动区锥体束神经元（PTN）的相关放电率变化。该任务包括准备期、预收缩期、收缩期和目标期。如果位移幅度从窄范围（10 - 20度）变为中等范围（40度），峰值速度、峰值加速度和收缩期呈线性增加，但预收缩期略有减少。在61个与运动相关的PTN中，未发现预收缩期或收缩期PTN放电率与位移幅度、速度、加速度、预收缩期或收缩期之间存在线性关系。然而，在不到20%的PTN中，在中等范围任务中发现预收缩期PTN放电率与速度或加速度之间存在相关性。在窄范围任务中这种情况发生的频率较低。在视觉跟踪任务中，据说PTN活动不依赖于与任务参数相关的因素，如速度、加速度。讨论了可能的相关因素。
