Authors: A. J. C. Reuten, Jelte Bos, J. B. J. Smeets Keywords: motion sickness, scaling, illness, symptoms Abstract: Motion sickness can be measured via a variety of self-report rating scales. These scales either focus on the progression of symptoms or on mere feelings of illness. It is unclear how these constructs relate to each other, which not only prevents a valid choice for a specific rating scale in studies on motion sickness but also complicates the interpretation and comparison of results between studies. For those reasons, we investigated this relationship by asking 114 subjects to rate the level of illness they associate with the symptoms used to describe the progression of motion sickness in the MIsery SCale (MISC). We did so by magnitude estimations and a twoalternative forced choice task. As a prerequisite, we confirmed that the MISC captures the progression of symptoms. We subsequently established that feelings of illness increase with the progression of symptoms, except for a considerable reduction of illness midway, at the transition of pre-nausea symptoms to nausea. This implies that a decrease in illness is not equivalent to a reversal in progression of symptoms. We conclude that the MISC does measure the progression of symptoms, while measures of illness are not suitable to monitor motion sickness progression.
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