Abstract
We refer to the preliminary results on the assessment of mental stress during a simulated cooperative work using physiological data, subjective one and work records. We developed a simulated crane task using virtual reality techniques. Four pairs of male subjects participated in the experiment. Their physiological and subjective data and work records were collected and analyzed. Using stress detection method triggered by physiological data, we obtained effective in formation to improve the cooperative Work. The entrainment phenomena between the two subjects'physiological data in the cooperative work were not ovserved clearly.