Hearing loss impacts aviator performance and cognitive workload during simulated flight

Hearing loss can render an aviator more susceptible to the adverse effects of degraded communication signals and consequently lead to an increased allocation of mental resources to hear (referred to as listening effort). Army aviation hearing standards, which are primarily based on pure tone and speech recognition test scores in quiet environments, do not necessarily predict the functional impact of hearing loss. The Army has recently adopted a new Military Operational Hearing Test (MOHT) to assess the functional impact of hearing loss. The current study aimed to validate the MOHT, specifically for aviators, and measure subjective workload, task performance, and physiological workload across different simulated hearing loss conditions in both clinical and flight simulator settings. Participants were Army aviators with normal hearing thresholds and underwent clinical testing using the MOHT for normal and hearing loss conditions. In addition to audiometric data, flight performance data were collected from pilots operating a full-motion UH-60 Black Hawk flight simulator for different levels of workloads and compared across the different hearing loss conditions. Subjective and physiological measurements of cognitive workload during simulated flight were also collected. Findings from this study will be leveraged in developing future protocols for aeromedical standards and evaluating hearing loss mitigation strategies using various headset technologies.