Animals 1 Article 1 Astronauts 1 Brain 1 Cognition 1 Extreme environments Hippocampus 1 Humans 1 Space Flight 1 Spaceflight 1 Spatial cognition 1 Time Factors 1 animal 1 astronomy 1 brain 1 carbon dioxide 1 cognition 1 cosmonaut 1 environmental stress 1 extreme environment 1 functional connectivity 1 human 1 immobilization 1 mental performance 1 moon 1 nerve cell plasticity 1 radiation 1 risk factor 1 sensory deprivation 1 social isolation 1