We exposed standing participants to optic flow in a moving room. Motion sickness was induced by motion that simulated the amplitude and frequency of standing sway. We identified instabilities in displacements of the center of pressure among participants who became sick; these instabilities occurred before the onset of subjective motion sickness symptoms. Postural differences between Sick and Well participants were observed before exposure to the nauseogenic stimulus. During exposure to the nauseogenic stimulus, sway increased for participants who became sick but also for those who did not. However, at every point during exposure sway was greater for participants who became motion sick. The results reveal that motion sickness is preceded by instabilities in displacements of the center of pressure.
Bibliographical noteFunding Information:
Thanks to Nat Hemasilpin and Gennadiy Rubinchik for motion control programming and control systems engineering. Supported by the National Institute on Deafness and Other Communication Disorders (R01 DC005387-01A2), and by the National Science Foundation (BCS-0236627 awarded to T. Stoffregen and CMS-0432992 awarded to M. Riley).
- Ecological psychology
- Motion perception
- Motion sickness
- Perceptual motor coordination