The influence of observer’s position to the subject during calculation task

This paper describes the influence of the observer’s position to the subject during a calculation task. Pulse waves from subject’s earlobe were measured during the calculation task and converted into the heartbeat interval to obtain the Lorenz Plot and the LF/HF for evaluating the subject’s stress. From results, when the observer was sat face to face with the subject, the subject’s stress became lower compared with other observer's positions. However, results of questionnaire investigation indicated that the subject felt the stress when the observer sat at the same position. Further studies need to investigate the difference.