Quantitative analysis of mental workload influence on eye scanning movements

The eye scanning behaviour is studied according to the momentary mental workload. Subjects perform a set of five concurrent sensorimotor tasks. The tasks demands switch between two levels-high and low-during the entire experiment. No significant changes are quantitatively found in indexes related to characteristics of ocular fixations and saccades between the two difficulty levels. On the other hand, results dealing with transitions between the five tasks and scanpaths agree with previous research indicating that visual behavior tends towards more organization-or less disorder-when difficulty increases