The investigators will study adaptation of motion perception and manual control in altered gravity, including the effects of a drug (promethazine). The investigators will also study whether promethazine affects motion perceptual thresholds.
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Percent Change in Roll Tilt Perception After Exposure to Hypogravity
Timeframe: 1 session
Yaw Perceptual Motion Threshold
Timeframe: 2 sessions separated by at least four days; measurements made 2 hrs after ingestion of medication
Roll Perceptual Motion Threshold
Timeframe: 2 sessions separated by at least four days; measurements made 2 hrs after ingestion of medication
Interaural Perceptual Motion Threshold
Timeframe: 2 sessions separated by at least four days; measurements made 2 hrs after ingestion of medication
Percent Change in Manual Control Performance After Exposure to Hypogravity
Timeframe: 1 session