Although the vast majority of missions flown by both the United States and Russia have been safe and successful, they have not been free of minor difficulties. Researchers believe that microgravity adversely affects the efficiency of crewmembers performing tasks in space. The various adaptations that occur when entering the microgravity environment, and the readaptations experienced when returning to Earth's gravity environment, cause changes in reaction time, mental acuity, and manual dexterity. Human factors research, as performed in the experiments below, explores the long-term effects of microgravity on crewmembers' physical and mental coordination during flight.
Crewmember and Crew-Ground Interactions during NASA-Mir
The Effectiveness of Manual Control During Simulation of Flight Tasks (Pilot)
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