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sessions was fixed for all participants. A modified standardized simulator sickness questionnaire 13 (SSQ) and the presence questionnaire (PQ) were administered to all subjects immediately after completion of the session. The Motion Sickness Susceptibility Questionnaire (MSSQ-Short) was administered to all subjects prior to the first session. Physiological Measurements The physiological response of gastric myoelectric activity was recorded by electrogastrogram (EGG) to objectively measure the degree and magnitude of simulator sickness. These EGG recordings

, with specific risks and concerns discussed with relevant subjects approved for inclusion as a part of informed consent. Some examples of inclusion and exclusion criteria are further described in Table I . Table I. Examples of Inclusion and Exclusion Criteria for Specific Medical Conditions. Predilection toward motion sickness was evaluated on all subjects via the Motion Sickness Susceptibility Questionnaire – Short Form (MSSQ); 8 motion sickness history was not exclusionary. Substantial experience in hypergravity environments (for example