SPATIAL TRAJECTORIES AND REACTION-TIMES OF AIMED MOVEMENTS - EFFECTS OF PRACTICE, UNCERTAINTY, AND CHANGE IN TARGET LOCATION
SPATIAL TRAJECTORIES AND REACTION-TIMES OF AIMED MOVEMENTS - EFFECTS OF PRACTICE, UNCERTAINTY, AND CHANGE IN TARGET LOCATION
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DOI：
10.1152/jn.1981.46.4.725
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发表时间：
1981-01-01
影响因子：
2.5
通讯作者：
MASSEY, JT
中科院分区：
文献类型：
--
作者：
GEORGOPOULOS, AP;KALASKA, JF;MASSEY, JT
研究了3只恒河猴（Macaca mulatta）在获得瞄准运动技能过程中，在空间和时间不确定性的条件下，当目标位置在反应或运动时间内发生变化时，从目标出现后50-400 ms，手臂运动的二维空间和时间特征。产生目标动作的过程显然随着练习而变得不那么可变，并且受主体对目标位置的不确定性的影响，而不是受其出现的时间的影响。由目标位置的改变所产生的运动的有序修改表明，目标运动命令是以连续的、持续的方式发出的，作为一个实时过程，该过程可以在任何时候被新目标替换的原始目标所中断。这种变化对随后运动的影响迅速显现，没有超过通常反应时间的延迟。在这些条件下没有观察到明显的心理不应期，并且第二刺激持续有效地进入产生目标手臂运动的过程。
Spatial and temporal characteristics of arm movements in 2 dimensions were studied in 3 rhesus monkeys [Macaca mulatta] during the acquisition of an aiming motor skill, under conditions of spatial and temporal uncertainty and when the location of the target changed during the reaction or movement time, from 50-400 ms after presentation of the target. The process that generates the aimed movement apparently becomes less variable with practice and is influenced by the uncertainty of the subject about the location of the target but not by the time of its appearance. The orderly modification of the movement produced by change in target location suggests that the aimed motor command is emitted in a continuous, ongoing fashion as a real-time process that can be interrupted at any time by the substitution of the original target by a new one. The effects of this change on the ensuing movement appear promptly, without delays beyond the usual reaction time. No appreciable psychological refractory period is observed under these conditions, and the 2nd stimulus has continual and effective access to the process generating the aimed arm movement.