Aim 1: Characterize and quantify changes in operationally-relevant sensorimotor and vestibular performance as a function of gravitational load. Aim 2: Characterize and quantify changes in physiology-particularly in brain function and autonomic activation during behavioral performance-as a function of gravitational load. Aim 3: Develop a model to predict behavioral performance and neurophysiological responses under different gravitational loads based on preflight ground testing data. (Hyp1) The investigators predict a monotonic but non-linear relationship between operational performance (grappling / postural sway) and gravitational load, with larger departures from 1g leading to more impaired performance. (Hyp2) The investigators predict a similar relationship between gravity load and physiological measures, with larger departures from 1g leading to larger changes in prefrontal and vestibular cortex, and autonomic nervous system activation. (Hyp3) Ground-based challenges to the vestibular system will induce detectable postural sway and neurophysiological responses. The amplitude of these responses and/or adaptation rates to the challenges (i.e., indicators of individual "sensitivity" to such provocations) will (3a) help predict neurophysiological responses in-flight, and (3b) help predict behavioral performance in flight.
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ROBoT-r
Timeframe: 10 days
Postural stability
Timeframe: 10 days