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Gravity-induced loss of consciousness (GLOC) is a major problem facing fighter pilots. In the throes of GLOC, pilots can travel 12 miles without control of their aircraft. The GLOC problem has proven to be difficult to resolve. Solutions involving repeated exposures to GLOC, G-suit pressure manipulation, intense sensory stimulation, and exposure to –G following the GLOC event have been unsuccessful. It is evident that a different approach is needed. One possibility might be an adaptive automation system to warn pilots of the imminence of a GLOC event. A key issue in adaptive automation is the cue to be employed in triggering the onset of automation. Using a centrifuge to simulate gravitational forces together with tracking and math tasks to simulate flight control and navigation, this study assessed the utility of a of cerebral tissue oxygen saturation (rSO2) measure as a possible triggering mechanism for an adaptive automation recovery system.