Kao H S
Percept Mot Skills. 1976 Dec;43(3 Pt 2):1339-45. doi: 10.2466/pms.1976.43.3f.1339.
Target intermittence in tracking has been studied as frequency of target presentation at various time intervals. Task efficiency increased as a function of increased frequency of target display in open-loop tracking tasks, where the steady state of presentation resulted in the best performance. The present study examined effects of feedback intermittency in compensatory tracking as a major source of disruption of the motor-sensory feedback process in the closed-loop tracking system. Feedback intermittency is defined as the feedback of momentary sampling of the difference between target movements and the operator's control motion for specified time lengths before being displayed to him in a continuous tracking task. With a random wave pattern of 9.76 cpm, 7 magnitudes of 0.0, 0.2, 0.4, 0.6, 0.8, 1.0, and 1.5 sec. were used to represent various levels of feedback intermittency. Task efficiency decreased as a function of increased magnitudes of intermittency. Results are discussed relative to the difference between target intermittence and feedback intermittency and their effects on different tracking tasks. The findings also establish the concept of feedback intermittency as a disturbing factor in compensatory tracking in degrading the operator's performance.
在追踪中，目标间歇性已作为目标在不同时间间隔呈现的频率进行了研究。在开环追踪任务中，随着目标显示频率的增加，任务效率也随之提高，其中呈现的稳定状态带来了最佳表现。本研究考察了补偿追踪中反馈间歇性的影响，它是闭环追踪系统中运动感觉反馈过程中断的主要来源。反馈间歇性被定义为在连续追踪任务中，在将目标运动与操作者控制运动之间的差异进行瞬间采样的反馈显示给他之前，持续特定时长。采用每分钟9.76次的随机波形，用0.0、0.2、0.4、0.6、0.8、1.0和1.5秒这7个幅度来表示不同程度的反馈间歇性。任务效率随着间歇性幅度的增加而降低。讨论了结果与目标间歇性和反馈间歇性之间的差异及其对不同追踪任务的影响。研究结果还确立了反馈间歇性作为补偿追踪中降低操作者表现的干扰因素这一概念。
