Physiological changes during computer tasks: responses to mental load or to motor demands?
Physiological changes during computer tasks: responses to mental load or to motor demands?
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DOI：
10.1080/00140139608964452
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发表时间：
1996-02
期刊：
影响因子：
2.4
通讯作者：
Olaf Kohlisch;Florian Schaefer
中科院分区：
文献类型：
--
作者：
Olaf Kohlisch;Florian Schaefer
心脏和皮肤电测量被认为是用户在计算机工作期间紧张的指标，没有考虑手指和手部运动对这些测量的可能影响。为了评估这种影响，运动需求和心理负荷都是不同的独立因素在两个实验。作为一项运动任务，受试者必须在不同的速度水平下产生补偿性的反射，以保持计算机屏幕上目标区域内的移动标记。在实验1中，通过操纵同步准确性来改变心理负荷，在实验2中，通过操纵记忆负荷来改变心理负荷。只有在非常高的打字速度下，生理指标才受到运动活动的影响。在较低水平的运动活动的生理效应完全依赖于精神负荷。皮肤电反应的频率是心理负荷的情绪后果的最敏感的指标和平均心动周期反映其注意方面。这项研究支持了这样一个假设，即在典型的计算机任务中，运动活动的生理影响可以忽略不计，需要以300 ms或更长的间隔进行重复。
Cardiac and electrodermal measures are regarded as indicators of user strain during computer work, not taking the possible influence of finger and hand movements on these measures into account. For the evaluation of such effects, motor demands and mental load were both varied as independent factors in two experiments. As a motor task, subjects had to produce compensatory keystrokes at different speed levels to keep a moving mark within a target area on the computer screen. Mental load was varied in experiment 1 by manipulation of keystroke synchronization accuracy, and in experiment 2 by manipulation of memory load. Physiological measures were affected by motor activity only at a very high typing speed. At lower levels of motor activity physiological effects were dependent exclusively on mental load. Frequency of skin conductance responses was the most sensitive indicator of the emotional consequences of mental load and mean heart period reflected its attentional aspects. The study supports the assumption that physiological effects of motor activity can be neglected during typical computer tasks, demanding keystrokes at intervals of 300 ms or longer.