ABSTRACT
ABSTRACT: This study aims to develop a physiological information system for monitoring human reliability in man-machine systems. The mental state of a worker, such as autonomic nervous activity, is evaluated using pupil diameter. In this study, two kinds of experiments are carried out. The former experiment is to investigate the relation between the change of pupil diameter and time pressure. On the other hand, it is investigated that the relation between the change of pupil diameter and resource pressure in the latter experiment. As well, in this experiment the EventRelated Potentials (ERP) obtained from electroencephalogram (EEG) as a quantitative index are measured to evaluate mental workload. It was found that (1) measurement of pupil diameter is an effective indicator of autonomic nervous activity, (2) based on the results of electroencephalogram, the amplitude of event-related potentials are dependent on mental workload.
