Ocular movements under taskload manipulations: Influence of geometry on saccades in air traffic control simulated tasks

Abstract

Traffic geometry is a factor that contributes to cognitive complexity in air traffic control. In conflictdetection tasks, geometry can affect the attentional effort necessary to correctly perceive and interpret the situation; online measures of situational workload are therefore highly desirable. In this study, we explored whether saccadic movements vary with changes in geometry. We created simple scenarios with two aircraft and simulated a conflict detection task. Independent variables were the conflict angle and the distance to convergence point. We hypothesized lower saccadic peak velocity (and longer duration) for increasing complexity, that is, for increasing conflict angles and for different distances to convergence point. Response times varied accordingly with task complexity. Concerning saccades, there was a decrease of peak velocity (and a related increase of duration) for increased geometry complexity for large saccades (>15 • ). The data therefore suggest that geometry is able to influence "reaching" saccades and not "fixation" saccades. C 2011 Wiley Periodicals, Inc.

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