Adult 1 Article 1 Bed Rest 1 CO2 1 Carbon Dioxide 1 Cerebellum 1 Cerebral Cortex 1 Connectome 1 Female 1 Head-Down Tilt 1 Humans 1 International Space Station 1 Magnetic Resonance Imaging 1 Male 1 Middle Aged 1 Nerve Net 1 Papilledema 1 SANS Space Flight 1 Young Adult 1 adult 1 bed rest 1 biochemical analysis 1 brain cortex 1 brain function 1 brain region 1 carbon dioxide 1 cerebellum 1 clinical article 1 clinical assessment 1