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- Title
MODELING G-INDUCED LOSS OF CONSCIOUSNESS (G-LOC): DETERMINATION BY AUDIOVISUAL CLUES - AGREE TO DISAGREE.
- Authors
Gallo, Megan; Kohne, Hannah; Potter, Lucas; Dooley, Christopher
- Abstract
INTRODUCTION: Historically, G-LOC events in human centrifuge exposures have been determined by observation from subject matter experts (SMEs). From 75 spins completed during this study, 45 G-LOC events were identified. The occurrence of G-LOC was determined via observation of live audio and camera feed from inside the centrifuge. This brief shall provide video examples of how the research team identified LOC through observation. Additionally, this brief will touch on the contentious debate of "almost" LOC. METHODS: For each G-LOC, three event times were recorded: time of suspected LOC, time of return to wakefulness, and time the participant resumed the visuomotor task. To identify LOC, researchers looked for indicators including dual eye closure, slumping of the head and upper body, and jaw muscle relaxation. Often, a combination of indicators occurred simultaneously with participants releasing a handbrake, and/or the head falling to the side or forward. The presence of aircrew flight equipment (AFE) did in some cases obscure determination of when or whether G-LOC had occurred. Return of wakefulness was identified by eyes reopening, sitting upright, and/or verbal feedback from the participant. Lastly, time to resumption of the task was identified by the participant replacing their hand on the joystick, and input on the task. The duration of time it took subjects to resume the visuomotor task also assisted in confirmation of whether G-LOC did in fact occur. After completion of the data collection session, the research team compared times, reviewed the video, and made a final determination of event times. Those event times were then merged into the physiologic and performance data files. DISCUSSION: Determination of LOC events in this study were consistent with previous work from Tripp et al. (2006) using similar indicators. Both efforts noted nuances in the phases of incapacitation, both absolute and relative. Comprehensive understanding of the phases of G-LOC are important in proper event determination, and ultimately aid in working towards protective measures for aircrew. Learning Objectives 1. Audience will learn visual indicators of loss of consciousness (LOC). 2. Audience will learn about the phases of G-induced loss of consciousness (G-LOC).
- Subjects
LOSS of consciousness; WAKEFULNESS; VISUAL learning; RESEARCH personnel; JOYSTICKS; RESEARCH teams
- Publication
Aerospace Medicine & Human Performance, 2024, Vol 95, Issue 8, p500
- ISSN
2375-6314
- Publication type
Article