出版社：National Institute of Occupational Safety and Health
摘要：Experiments were performed to determine the effectiveness of signal rates on phy-siological functions and detection performance during a visual vigilance task. Experi-ment I employed a rate of 183 signals/ hr ; experiment II employed a rate of 35/hr. Subjects were 10 male college students and they watched the clock panel and responded to the signals by pressing a key during 2 hours. Same subject performed the task on the two experimental conditions. It was found that the initial increase of galvanic skin reflex (GSR) frequency could be seen at the start of the task, whereas the changes of respiratory rate, heart rate and amplitude of rhythmic fluctuation of blood volume did not occur. It was also found that respiratory rate, amplitude of waves and GSR frequency showed approximately the same value in both experiments, except that the heart rate in experiment I was higher than that in experiment II. It was interesting that the subjects reported that experiment I was easily performed as compared with experiment II, though experiment I seemed to be harder than experiment II from the viewpoint of the heart rate. The detection performance in experiment I was generally similar to that in experi-ment II. Clear relationship between the variations in these physiological functions and detection performance with time course could not be found, nor did unique changes of the instantaneous physiological responses corresponding the cases of missing and pushing the key in absence of signal occur.
