Participants were tested using head-mounted headphones in a −12° head-down (HD) bed rest simulating microgravity, where the headphones play 60 dBA noise to simulate space station background noise. The aim of this study was to investigate the effects of light illumination on near-infrared brain images, the emotions and satisfaction level of astronauts during the disposal of metabolic waste in the hygiene area of the space station. The use of appropriate lighting in the hygiene areas of the ISS can help provide a comfortable experience for the astronauts and thereby reduce their stress. ![]() Astronauts are forced to deal with stress from microgravity, claustrophobic environments and loud noise during missions on the space station, which can have a variety of negative psychological and physiological effects on astronauts.
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