Busy and confused? High risk of missed alerts in the cockpit: an electrophysiological study

Causse, Mickael; Parmentier, Fabrice B. R.; Mouratille, Damien; Thibaut, Dorothée; Kisselenko, Marie; Fabre, Eve · 2022 · Crossref

DOI: 10.1101/2022.01.07.475323

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Summary

This study investigates the combined impact of mental workload and auditory load on the detection of critical auditory alarms in high-stakes environments, such as aircraft cockpits. While previous research has examined these factors independently, this work addresses the gap in understanding their interactive effects on attentional resources and alert responsiveness. The authors hypothesized that high mental load and complex auditory environments would synergistically increase the rate of missed alerts, a phenomenon linked to inattentional deafness. The experimental design involved sixty participants with aeronautical knowledge who performed a simulated aviation landing task while concurrently engaging in a tone detection paradigm. Mental load was manipulated within-subjects across three levels: no load (ignoring the aviation task), low load (simple decision criteria), and high load (complex decision criteria involving multiple indicators). Auditory load was manipulated between-subjects using three variations of an oddball paradigm: a 1-tone condition (target only), a 2-tone condition (target and standard), and a 3-tone condition (target, standard, and deviant distractors). The target tone frequency remained constant (1970 Hz) across conditions to isolate the effect of auditory complexity. Researchers measured behavioral performance (miss and false alarm rates) and electrophysiological activity using event-related potentials (ERPs), specifically focusing on the P3b component, which indexes attentional resource allocation and context updating. The results demonstrated that both mental and auditory loads significantly impaired tone detection performance, with a pronounced interactive effect. In the no mental load condition, miss rates were negligible for the 1-tone (0.53%) and 2-tone (1.11%) paradigms but rose sharply to 24.44% in the 3-tone paradigm. This effect was drastically exacerbated under high mental load, where the miss rate in the 3-tone condition reached 68.64%. Electrophysiological data revealed that increased mental load, auditory load, and higher miss rates were all associated with reduced P3b amplitudes. This reduction indicates that high cognitive demands and auditory complexity disrupt the brain’s ability to allocate attentional resources to detect and process target stimuli. The study concludes that the combination of high mental workload and complex auditory environments creates a high risk for missed alerts, primarily by depleting the attentional reserves necessary for involuntary orienting and voluntary detection. The findings underscore the critical importance of balancing mental and auditory loads in safety-critical systems to maintain operator situational awareness. By highlighting the specific neural mechanisms (P3b reduction) underlying these failures, the research provides evidence-based insights for designing alarm systems and training protocols that mitigate inattentional deafness in complex operational settings.

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Topics

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• signal detection theory
• auditory warnings
• auditory
• workload measurement

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• Empirical Findings: physiological data
• Theoretical Contribution: theory or model