Pilot Eye Movements Change Noticeably By Two Hours In-Flight
Mar 15, 2017
Brooklyn, NY 鈥� Pilot fatigue is a major contributor to aviation disasters, but coming up with an objective measure of fatigue has long eluded supervisors in both military and commercial airlines. Standard practice involves a combination of subjective self-report measures by the pilot, and an assessment by commanding officers. With numerous factors at play, including social and financial ones, how can one objectively determine a pilot鈥檚 ability to focus and fly safely?
A study published recently in the journal Psychology and Behavior unveils the potential to use changes in saccadic eye movements - the rapid repositioning of the eye to focus on a target - as a reliable biomarker for pilot fatigue. Stephen Macknik, PhD, and Susana Martinez-Conde, PhD, both professors of ophthalmology, neurology, and physiology and pharmacology at 含羞草研究所, were co-authors in the study.
鈥淲e measured fatigue in the pilots by looking at their eye movements with a camera. Eye tracking is remarkably effective at noticing small changes in brain state, because eye movements are controlled by so many levels of the brain, including low-level neural circuits that control the ocular muscles, through the cognitive decision-making system that decides where to look,鈥� said Macknik.
Study participants included US Marine Corps combat helicopter pilots, who performed oculomotor testing paired with either a long or short simulated mission. Researchers assessed the pilot's eye movements before and after each mission. Results indicated that the pilots鈥� saccadic eye movement velocity decreased significantly after long flights. After short flights, saccadic velocity did not change.
鈥淭he pilots were doing their regular training sessions in large moving combat helicopter simulators,鈥� Macknik said. 鈥淲e measured their ability to move their eye around a TV screen before and after each training session, and hoped we would find some aspect of the training that would result in a clear change in oculomotor behavior.鈥�
鈥淲e found that the eyes slowed down when the training sessions extended beyond one hour,鈥� Macknik said.
The short flight group鈥檚 average simulated flight time was just under one hour. The long flights averaged just less than two hours.
鈥淚t鈥檚 incredibly interesting that we could reliably determine a brain-state change using a non-invasive oculomotor biomarker that is so sensitive as to measure fatigue in young, healthy military personnel, in as little as one hour,鈥� said Macknik. 鈥淭hese simulator training sessions can be intense, but they are essentially not very different than playing a video game.鈥�
鈥淲e did not expect to find such an important revelation with a short six-minute test on a healthy pilot doing standard training,鈥� Macknik said.
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