Title:  Reliability of Psychophysiological Responses Across Multiple Motion Sickness Stimulation Tests
Authors:  C. Stout, W.B. Toscano, and P.S. Cowings
Reference:  Journal of Vestibular Physiology, 5(1):25-33, 1995

Although there is general agreement that a high degree of variability exists between subjects in their autonomic nervous system responses to motion sickness stimulation, very little evidence exists that examine the reproducibility of autonomic responses within subjects during motion sickness stimulation. Our objectives were to examine the reliability of autonomic responses and symptom levels across five testing occasions using the (1) final minute of testing, (2) change in autonomic response and the change in symptom level, and (3) strength of the relationship between the change in symptom level and the change in autonomic responses across the entire motion sickness test. Results indicate that, based on the final minute of testing, the autonomic responses of heart rate, blood volume pulse, and respiration, and symptoms throughout the test duration are stable across tests. Finally, autonomic responses and symptom levels are significantly related across the entire motion sickness test.