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JSC2007-E-22737 (7 May 2007) --- NASA flight surgeon Josef F. Schmid works with the Psychomotor Vigilance Test (PVT) inside the undersea habitat for the 12th NASA Extreme Environment Mission Operations (NEEMO) mission. The PVT is a portable 3-minute reaction time task that will allow the investigator to monitor the daily effects of fatigue on performance. The stress measure to be used in this study will be daily saliva samples from which the hormone cortisol will be extracted. The NEEMO 12 crew is spending 12 days, May 7-18, on an undersea mission aboard the National Oceanic and Atmospheric Administration's (NOAA) Aquarius Underwater Laboratory, which is operated by the University of North Carolina at Wilmington and located off the coast of Key Largo, Florida.
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