Psychomotor Vigilance Self Test on ISS (Reaction Self Test on Expeditions 21 and 22)

The experiment addresses the following high-priority NASA Risk Gaps in the Behavioral Health and Performance (BHP) area: 1) Identify brief, valid objective measures of changes in cognitive functions during spaceflight that astronauts can use with minimal burden. 2) Find a practical objective aid for astronauts to quickly identify and manage the effects of fatigue (from sleep loss, circadian disruptions, workload and other factors) on their performance during space flight