Blinking and Driving: the Influence of Saccades and Cognitive Workload

Cardona, Genís; Quevedo, Noa · 2013 · Crossref

DOI: 10.3109/02713683.2013.841256

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Summary

This study investigates the joint influence of cognitive workload and saccadic eye movements on spontaneous blink rate (SBR) during real-life driving. While previous research indicates that high cognitive demands typically reduce blink frequency, large-amplitude saccades are often accompanied by blinks to maintain visual stability. The authors sought to determine how these opposing factors interact in a dynamic visual environment, hypothesizing that increased driving complexity would alter blink patterns through changes in cognitive load and gaze shifts. The experiment involved twenty healthy volunteers who drove a vehicle through a predefined 60-minute circuit comprising rural and urban roads. Driving complexity was categorized into five levels based on navigational difficulty and traffic intensity, ranging from stationary at traffic lights to complex roundabout interchanges. Ocular movements and blinking were recorded via video cameras mounted on the dashboard. Researchers analyzed one-minute segments from each complexity level, classifying saccades by amplitude (small vs. large) and identifying blink-saccade pairs. Statistical analysis included ANOVA for repeated measures to compare metrics across complexity levels. The results demonstrated that spontaneous blink rate remained statistically constant across all five complexity levels, averaging 20.3 blinks per minute. Contrary to the hypothesis that cognitive load would suppress blinking, SBR did not decrease as driving difficulty increased. However, the number of large-amplitude saccades significantly increased with higher complexity levels. Consequently, the frequency of blink-saccade pairs also rose significantly at higher complexity levels, with approximately 87.5% of large-amplitude saccades accompanied by a blink. The total number of saccades per minute remained stable, but the proportion of large-amplitude shifts grew, driving the increase in paired blinks. The findings suggest that in complex, dynamic visual settings, the increase in large-amplitude saccades compensates for the potential reduction in blink rate associated with high cognitive demands. The synchronization of blinks with large gaze shifts likely helps counteract the visual suppression deficits inherent in large saccades, thereby maintaining visual stability. This mechanism allows drivers to sustain a consistent blink rate despite varying cognitive loads, highlighting the adaptive nature of ocular motor control in real-world tasks. The study underscores the importance of considering saccadic behavior when analyzing blink rates in high-demand environments.

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Topics

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• eye movements scanning
• temporal
• inattentional change blindness
• road complexity
• visual occlusion
• gaze based attention detection

Information type

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• Empirical Findings: physiological data, behavioral performance data
• Methodological Resource: measurement protocol