Fleischer A G
Bundesanstalt für Arbeitsschutz, Dortmund 1, Federal Republic of Germany.
Biol Cybern. 1989;60(4):311-21. doi: 10.1007/BF00204129.
The presented approach focuses on the attempt to specify strategies of visually organizing sequences of different hand movements and the resulting fine-control of movement close to the target, since in skilled activities our ability to sequence a number of separate movements each having different spatiotemporal characteristics is of central importance. Sequences of different moves have been analysed here. After a gross distance covering part of the move, small correction movements are performed close to the target to reduce the position error. The length of the required correction movements and the corresponding positioning time increase with target distance. In order to investigate motor control strategies two different tasks, with and without time pressure, have been designed. Time pressure forces the subjects to finish the previous move and to prepare the next move simultaneously. Absolute, constant and variable errors revealed that under time pressure the subject changes the control strategy by increasing the constant and reducting the variable error.
所提出的方法着重于尝试明确视觉上组织不同手部动作序列的策略以及由此对接近目标时的精细运动控制，因为在熟练活动中，我们对一系列各自具有不同时空特征的单独动作进行排序的能力至关重要。这里分析了不同动作的序列。在完成动作的大致距离部分后，在接近目标处进行小的校正动作以减少位置误差。所需校正动作的长度和相应的定位时间随目标距离增加。为了研究运动控制策略，设计了两项不同的任务，有时间压力和无时间压力的情况。时间压力迫使受试者同时完成前一个动作并准备下一个动作。绝对误差、恒定误差和可变误差表明，在时间压力下，受试者通过增加恒定误差和减少可变误差来改变控制策略。
