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Eye movement indices of mental workload
J G May1, R S Kennedy, M C Williams
1Dept. of Psychology, University of New Orleans, LA 70148.
Acta Psychologica
|October 1, 1990
Summary
Researchers found that the range of eye movements, specifically saccadic extent, significantly decreased with increasing mental workload during auditory counting tasks. This eye movement measure shows promise as a reliable indicator of cognitive load.
Area of Science:
- Cognitive Psychology
- Human Factors Engineering
- Neuroscience
Background:
- Mental workload assessment is crucial for optimizing human performance and safety.
- Traditional workload measures can be intrusive or subjective.
- Objective physiological measures are needed for real-time workload evaluation.
Purpose of the Study:
- To investigate the feasibility of using eye movement measures, specifically saccadic extent, as objective indices of mental workload.
- To determine if changes in saccadic range correlate with varying levels of cognitive task complexity.
Main Methods:
- Four experiments were conducted involving auditory tone counting tasks of varying complexity.
- Saccadic extent and range of spontaneous and elicited eye movements were measured.
- Tasks included free viewing, visual tasks without fixation, and optokinetic stimulation.
Main Results:
- A significant decrease in saccadic extent was observed as the complexity of the auditory tone counting task (mental workload) increased.
- This effect persisted even with practice, indicating a robust relationship.
- Both spontaneous and elicited eye movements showed restricted range with increased cognitive load.
Conclusions:
- Saccadic eye movement measures, particularly saccadic range, are significantly restricted by increasing mental workload.
- Eye movement metrics represent a promising, objective, and non-intrusive index for assessing mental workload in various applications.