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Subjective Vertical Conflict Theory and Space Motion Sickness
Wei Chen1, Jian-Gang Chao, Jin-Kun Wang
1National Key Laboratory of Human Factors Engineering and the State Key Laboratory of Space Medicine Fundamentals and Application, China Astronaut Research and Training Center, Beijing, China.
Space motion sickness (SMS) is a challenge in spaceflight. The subjective vertical (SV) conflict theory explains SMS by a mismatch between sensed and expected vertical orientation, aiding in prediction and prevention.
Area of Science:
- Neuroscience
- Aerospace Medicine
- Human Physiology
Background:
- Space motion sickness (SMS) poses significant challenges for astronauts.
- The subjective vertical (SV) conflict theory posits that mismatches in perceived verticality cause motion sickness.
- This theory has demonstrated efficacy in predicting motion sickness in terrestrial environments.
Purpose of the Study:
- To explore the relationship between subjective vertical (SV) and space motion sickness (SMS).
- To provide a framework for understanding and predicting SMS in weightlessness.
Main Methods:
- Review of recent studies on spatial disorientation and SMS during weightlessness.
- Analysis of illusions such as cognitive mapping, mental rotation, and visual reorientation.
- Examination of orientation preferences relative to visual scenes and the body's internal axis.
Main Results:
- Investigated the correlations between subjective vertical (SV) and the occurrence/severity of SMS.
- Addressed the link between SV and spatial disorientation in microgravity.
Conclusions:
- Presented a unified framework based on SV conflict theory for SMS.
- This framework is anticipated to enhance SMS prediction, prevention, and astronaut training.
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