Pupil Diameter and the Cross-Adaptive Critical Tracking Task; a Method of Workload Measurement.
NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF
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Two new applications of established techniques for measuring an individuals level of stress workload in tracking tasks are presented. An indirect technique of measuring reserve capacity is utilized in a two-axis cross-coupled compensatory tracking task. A direct psychophysiological measurement is made by recording time histories of operator pupil diameter. The level of instability in the second axis of the cross-adaptive method is shown to be related to the level of workload in the primary axis. Increased pupil diameter is shown to be similarly related to operator workload.