Pupil diameter size marker for incremental mental stress detection

This paper describes a new statistical based study of the pupil diameter marker for the detection of incremental levels of mental stress in operators who are subjected to mental stress. In order to achieve an acceptable and an incremental level of mental stress, the operators were subjected from two to four sessions each of an arithmetic operations based test of varying difficulty. The experiment was performed on 4 healthy subjects of ages varying from 27 to 45 and for a total of 13 experiment sessions. In order to account for the effect of fatigue in the experiment, the order of the difficulty levels was varied for different sessions. The results obtained demonstrate the effectiveness of the pupil diameter marker as a viable incremental predictor of mental stress as inferred from the obtained two-sample statistical t-test.