PERCLOS as an Indicator of Slow-Onset Hypoxia in Aviation

Aerospace Medicine and Human Performance
Jennifer E ThroppPaul Buza

Abstract

PERCLOS is a metric that has been primarily studied in the domain of driver fatigue to predict performance decrements, but there is comparatively less research applying it to aviation, where hypoxia is a safety concern. Hypoxic exposure was expected to increase blink activity, possibly by means of impairing blink inhibition behavior, thereby leading to increased eyelid closure time. PERCLOS, blink rate, and blink duration were measured using head-mounted eye-tracking on pilots using a flight simulator inside a hypobaric chamber. Pilot subjects were tasked with programming the autopilot of a G-1000 console according to instructions from a simulated air traffic controller. Data was collected at 5% decrements in blood oxygen saturation (Spo2) through progressive decreases in hypobaric pressure to model slow-onset hypoxia. PERCLOS, blink rate, and blink duration increased significantly and linearly as a function of decreasing Spo2, and largely recovered in the posthypoxia normoxia condition. The greatest change in PERCLOS relative to the prehypoxia baseline occurred in the 80% Spo2 condition, whereas the greatest change in blink rate and duration occurred at 75% Spo2. As Spo2 decreased, a higher frequency of long blink durations wa...Continue Reading

Citations

Nov 8, 2020·Multiple Sclerosis and Related Disorders·Hannes DevosCatherine Siengsukon

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