Abstract
To control large system such as large tanker is diffi cult for human operator, so that previous studies have madethe characteristics of making progress in the predictive manual control clear. However, the relation between themanual control skill and the operator's mental activity has not been revealed although some human informationprocessing model has estimated according to some observational studies (for example Rasmussen's SRK-model iswidely known). In this study, we tried to make it clear that there is the causal relationship between the mentalactivity and the performances in steering large tanker using the operator's background electroencephalogram (EEG)through simulator experiment. Every subject's EEG were measured based on international 10-20 method whilethe subject tried to steer the tanker. In this experiment, twelve male students ranging from twenty to twentyfouryears old participated. As the result, every subject progressed in the predictive manual control of the tankerstatistically from the view of the subject's performance. On the other hand, the amplitude of theta waves at Fzrelating to the operator's highest concentration was revealed before their manual control skill of their performancewas highest. Consequently, the relation between the operator's mental activities and their performance could befound.
