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Physiological Parameter Response to Variation of Mental Workload
Adrian Cornelius Marinescu, Sarah Sharples, Alastair Campbell Ritchie1
1University of Nottingham, Nottingham, United Kingdom.
Human Factors
|October 3, 2017
Summary
Noninvasive monitoring of physiological responses, including pupil diameter and facial thermography, can accurately measure mental workload in real-time. These methods offer valuable insights for assessing cognitive demand in seated work environments.
Area of Science:
- Human-Computer Interaction
- Cognitive Science
- Biomedical Engineering
Background:
- Previous research focused on individual physiological measures and subjective workload reports.
- This study investigates multiple physiological parameters to quantify their combined value in estimating mental demand.
Purpose of the Study:
- To examine the relationship between experienced mental workload and physiological responses using noninvasive monitoring.
- To quantify the added value of multiple physiological parameters in estimating mental workload.
Main Methods:
- Laboratory study involving a visual-motor task with varying demand levels.
- Collected physiological data: heart interbeat intervals, breathing rate, pupil diameter, facial thermography.
- Collected subjective workload ratings (Instantaneous Self-Assessment Workload Scale, NASA-Task Load Index) and performance data.
Main Results:
- Pupil diameter showed strong correlations (R=.61–.79, p<.01) with workload for most participants.
- Facial thermography explained an additional 47.7% of the variability in task performance.
- Significant interparticipant variability observed in the relationship between physiological measures, workload, and performance.
Conclusions:
- Physiological measures and pupil diameter are effective for noninvasive, real-time workload assessment.
- The methods are suitable for seated work environments, with potential applications for pilots and air traffic controllers.
