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Motion Perception: Vestibular Adaptation to G-Transitions (ILSRA_2004_260)
Principal Investigator
Research Area:
Behavior and performance
Species Studied
Scientific Name: Homo sapiens Species: Human

The main scientific objective of this experiment is to gain insight into the process of how the body's vestibular system adapts to the absence of gravity. In humans, the vestibular system together with visual information determines the body's coordination, posture and balance and the perception of movement and orientation.

The adaptation in the vestibular system will be assessed by comparing the perception of motion against the real movement of the body. To this end, the astronaut will be asked to fill in a short questionnaire every day during the spaceflight, wherein he reports his motion sensation as a result of head movements around the three principal axes. Head movements are important in the experiment as the inner ear is the location of the sensory organs of the vestibular system.

The astronaut will also be questioned on whether he experiences any discomfort regarding space adaptation syndrome (SAS), commonly known as `space sickness', caused by their daily activities. A second objective of the Motion Perception experiment is to correlate an astronaut's susceptibility to space sickness with a susceptibility to sickness induced by centrifugation. Sickness induced by centrifugation is a condition with similarities to space sickness. A pre-flight ground experiment will be performed wherein the astronaut's susceptibility to sickness induced by centrifugation is assessed by exposing him to hypergravity (approximately 3g) in a centrifuge.

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E. Groen, J. Bos, S. Nooij. Final Results of the MOP Experiment: Ground-based Simulation of Space Adaptation Syndrome. Conference Paper for Life in Space for Life on Earth Symposium, Aberdeen, United Kingdom, 18-22 June 2012.

Groen E, Bos JE, Nooij SA. A rationale for space motion sickness. Aviat Space Environ Med 2011 Jul;82(7):737.[]

Nooij, SAE and Vanspauwen, R and Bos, JE and Wuyts, FL. A re-investigation of the role of utricular asymmetries in Space Motion Sickness. Journal of Vestibular Research. 2011;21(3):141-51. doi: 10.3233/VES-2011-0400. []

Motion perception
Motion sickness
Otolithic membrane
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Data Information
Data Availability
Archive is complete. No data sets are available for this experiment. Please Contact LSDA if you know of available data for this investigation.

Eve movements
Gravity levels
Head movements
Motion sensation
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Mission/Study Information
Mission Launch/Start Date Landing/End Date Duration
Expedition 10 10/13/2004 04/24/2005 193 days
Expedition 11 04/14/2005 10/10/2005 179 days
Expedition 12 09/30/2005 04/30/2006 180 days
Expedition 16 10/10/2007 04/19/2008 192 days
Expedition 18 10/12/2008 04/17/2009 187 days
Expedition 19 03/26/2009 10/11/2009 199 days
Expedition 20 05/27/2009 10/11/2009 137 days
Expedition 8 10/18/2003 04/29/2004 195 days
Expedition 9 04/18/2004 10/23/2004 188 days
STS-119 02/22/2009 03/07/2009 14 days

Additional Information
Managing NASA Center
Johnson Space Center (JSC)
Responsible NASA Representative
Johnson Space Center LSDA Office
Project Manager: Pamela A. Bieri
Institutional Support
European Space Agency (ESA)
Alternate Experiment Name