Effects of Visual Display and Motion System Delays on Operator Performance and Uneasiness in a Driving Simulator

Frank, Lawrence H.; Casali, John G.; Wierwille, Walter W. · 1988 · OpenAlex-citations

DOI: 10.1177/001872088803000207

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Summary

This dissertation investigates the impact of visual display and motion system delays on operator performance and uneasiness within a driving simulator. The research is motivated by the prevalence of "simulator sickness," a condition characterized by symptoms akin to motion sickness that arises from sensory cue mismatches. Such sickness compromises training validity, induces negative transfer to real-world operations, and poses ethical and safety risks. Preliminary data suggested that visual-motion coupling delays are a critical, controllable factor in inducing these symptoms, with significant discrepancies observed between simulators with high delays (approx. 400 ms) and those with low delays (47–77 ms). The study employed a two-factor, between-subjects central-composite design using Response Surface Methodology (RSM). Three levels of visual delay and three levels of motion delay were completely crossed to create nine treatment conditions. Six subjects were assigned to each condition, balanced for gender and pretest scores on the rod-and-frame test to account for perceptual style. The driving simulator was modified to introduce and control specific delays. Data collection included ten reliable measures of driving performance (e.g., yaw standard deviation, steering reversals), physiological indicators (breath cycles), postural disequilibrium tests, and the Simulator Sickness Severity Index. The primary finding was that visual delay is significantly more disruptive to both control performance and operator well-being than motion delay. Empirical multiple regression models were derived to predict the ten dependent measures. Principal components analysis decomposed these measures into two significant factors: "vestibular disruption" and "degraded performance." The results indicated that increases in visual delay led to greater vestibular disruption, higher simulator sickness severity, and poorer driving performance metrics, such as increased yaw standard deviation and steering reversals. Motion delay showed less pronounced effects on these outcomes. The study also examined the interaction of these delays with perceptual style and sex, finding that visual delay remained the dominant predictor of discomfort and performance degradation across groups. These findings imply that simulator design must prioritize minimizing visual system latency to ensure fidelity and operator comfort. The results support the perceptual conflict theory, suggesting that temporal mismatches between visual and vestibular cues are a primary source of simulator sickness. By identifying visual delay as the more provocative factor, the study provides specific guidance for simulator engineers to optimize motion cueing algorithms and display systems. This reduces the risk of simulator sickness, thereby preserving training effectiveness, ensuring valid data collection, and mitigating safety hazards associated with postural disequilibrium and disorientation after simulator exposure.

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• simulator sickness
• simulator validity fidelity

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• Methodological Resource: tool software