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Psychological and sociological effects of space flight are important to understanding how to successfully achieve the goals of long-duration expeditionary missions. Although robotic spacecraft have landed on Mars, plans have also been discussed for a human expedition, perhaps in the 2030s, or as early as 2021 for a return mission, or even in 2018 for a 501-day flyby mission for a crew of two with no landing on Mars. A Mars return expedition may last two to three years and may involve a crew of four to seven people, although shorter flyby missions of approximately one and half years with only two people have been proposed,〔 as well as one-way missions that include landing on Mars with no return trip planned. Although there are a number of technological and physiological issues involved with such a mission that remain to be worked out, there are also a number of behavioral issues affecting the crew that are being addressed before launching such missions. In preparing for such an expedition, important psychological, interpersonal and psychiatric issues occurring in human spaceflight missions are under study by national space agencies and others. In October 2015, the NASA Office of Inspector General issued a health hazards report related to human spaceflight, including a human mission to Mars. ==Psychosocial issues on-orbit== Researchers have conducted two NASA-funded international studies of psychological and interpersonal issues during on-orbit missions to the Mir and the International Space Station. Both crew members and mission control personnel were studied. The Mir sample involved 13 astronauts and cosmonauts and 58 American and Russian mission control personnel. The corresponding numbers in the ISS study were 17 space travelers and 128 people on Earth. Subjects completed a weekly questionnaire that included items from a number of valid and reliable measures that assessed mood and group dynamics. Both studies had similar findings. There was significant evidence for the displacement of tension and negative emotions from the crew members to mission control personnel. The support role of the commander was significantly and positively related to group cohesion among crew members, and both the task and support roles of the team leader were significantly related to cohesion among people in mission control. Crew members scored higher in cultural sophistication than mission control personnel. Russians reported greater language flexibility than Americans. Americans scored higher on a measure of work pressure than Russians, but Russians reported higher levels of tension on the ISS than Americans. There were no significant changes in levels of emotion and group interpersonal climate over time. Specifically, there was no evidence for a general worsening of mood and cohesion after the halfway point of the missions, an occurrence some have called the 3rd quarter phenomenon.〔Bechtel, R.B., Berning, A. (1991). The third-quarter phenomenon: Do people experience discomfort after stress has passed? In: A.A. Harrison, Y.A. Clearwater, C.P., McKay, eds. From Antarctica to Outer Space. New York: Springer-Verlag.〕 Other psychosocial studies involving astronauts and cosmonauts have been conducted. In one, an analysis of speech patterns as well as subjective attitudes and personal values were measured in both on-orbit space crews and people working in space analog environments. The researchers found that, over time, these isolated groups showed decreases in the scope and content of their communications and a filtering in what they said to outside personnel, which was termed psychological closing. Crew members interacted less with some mission control personnel than others, perceiving them as opponents. This tendency of some crew members to become more egocentric was called autonomization.〔Gushin, V.I., Zaprisa, N.S., Kolinitchenko, T.B., Efimov, V.A., Smirnova, T.M., Vinokhodova, A.G., Kanas, N. (1997). Content analysis of the crew communication with external communicants under prolonged isolation. Aviat., Space, Environ. Med., 68, 1093-1098.〕〔Gushin, V.I. (2003). Problems of distant communication of isolated small groups. Human Physiol., 29, 548-555.〕 They also found that crew members became more cohesive by spending time together (for example, joint birthday celebrations),〔Gushin. V.I., Pustynnikova, J.M., Smirnova, T.M. (2001). Interrelations between the small isolated groups with homogeneous and heterogeneous composition. Human Perf. in Extreme Environ., 6, 26-33.〕 and that the presence of subgroups and outliers (e.g., scapegoats) negatively affected group cohesion.〔Gushin, V.I., Efimov, V.A., Smirnova, T.M., Vinokhodova, A.G, Kanas, N. (1998). Subject's perception of the crew interaction dynamics under prolonged isolation. Aviat., Space, Environ. Med., 69, 556-561.〕 In a study of 12 ISS cosmonauts, researchers reported that personal values generally remained stable, with those related to the fulfillment of professional activities and good social relationships being rated most highly.〔Vinokhodova, A.G., Gushin, V.I. (2012). Study of values and interpersonal perception in cosmonauts on board of International Space Station. Paper # IAC-12-A1.1.8. International Astronautical Federation. Proceedings, 63rd International Astronautical Congress, Naples, Italy, October 1–5, 2012.〕 Another study examined potentially disruptive cultural issues affecting space missions in a survey of 75 astronauts and cosmonauts and 106 mission control personnel. The subjects rated coordination difficulties between the different space organizations involved with the missions as the biggest problem. Other problems included communication misunderstandings and differences in work management styles.〔Tomi, L., Kealey, D., Lange, M., Stefanowska, P., Doyle, V. (2007). Cross-cultural training requirements for long-duration space missions: Results of a survey of International Space Station astronauts and ground support personnel. Paper delivered at the Human Interactions in Space Symposium, May 21, 2007, Beijing, China.〕 In a study of 11 cosmonauts regarding their opinions of possible psychological and interpersonal problems that might occur during a Mars expedition, researchers found several factors to be rated highly: isolation and monotony, distance-related communication delays with the Earth, leadership issues, differences in space agency management styles, and cultural misunderstandings within international crews.〔Nechaev, A.P., Polyakov, V.V., Morukov, B.V. (2007). Martian manned mission: What cosmonauts think about this. Acta Astronaut., 60, 351-353.〕 In a survey of 576 employees of the European Space Agency (ESA), a link was found between cultural diversity and the ability of people to interact with one another. Especially important were factors related to leadership and decision-making.〔Sandal, G.M., Manzey, D. (2009). Cross-cultural issues in space operations: A survey study among ground personnel of the European Space Agency. Acta Astronaut., 65, 1520-1529.〕 Another study looked at content analysis of personal journals from ten ISS astronauts that were oriented around a number of issues that had behavioral implications. Findings included that 88% of the entries dealt with the following categories: Work, Outside Communications, Adjustment, Group Interaction, Recreation/Leisure, Equipment, Events, Organization/Management, Sleep, and Food. In general, the crew members reported that their life in space was not as difficult as they expected prior to launch, despite a 20% increase in interpersonal problems during the second half of the missions. It was recommended that future crew members be allowed to control their individual schedules as much as possible.〔Stuster, J. (2010). Behavioral Issues Associated with Long-Duration Space Expeditions: Review and Analysis of Astronaut Journals. Experiment 01-E104 (Journals): Final Report. NASA/TM-2010-216130. Houston, Texas: NASA/Johnson Space Center.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Psychological and sociological effects of spaceflight」の詳細全文を読む スポンサード リンク
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