I don't think it's ethical to continue with the study unless you state in the consent form that simulator sickness is a likely risk of participation in the study.  As far as simulator sickness, it's quite common.  The prevalence is higher in women and older adults.  There is too much discrepancy between the information that the visual system is receiving and the lack of matching vestibular input - this causes simulator sickness.  One does not have to get motion sickness to get simulator sickness.

Hope this helps.
Wendy Stav, PhD, OTR/L, CDRS

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