Authors: Jelte Bos, Ouren X. Kuiper, Eike A. Schmidt Keywords: motion, motion sickness, predictability, anticipation Abstract: Although the effect of motion predictability on motion sickness seems common knowledge, relevant literature is scarce. We therefore performed two experiments. In Experiment A, 17 subjects were exposed to 15 minutes of repeated forward/backward motions on a linear sled, repeated within subjects in three ways: 1) using identical motions interrupted by equal standstills, 2) using randomly reversed motions interrupted by equal standstills, and 3) using identical motions interrupted by semi-randomly varied intervals of standstill. In Experiment B, 20 subjects were exposed to similar motion in which both temporal and directional factors varied. Within subjects, this profile was presented in two ways: 1) each motion being preceded one second ahead by a soundclip telling “forward” or “backward”, and 2) the same cues presented during the motion. Sickness was rated using an 11-point misery-scale. Experiment A revealed no difference between the two unpredictable conditions, which gave 52% higher sickness ratings than the predictable condition. Experiment B revealed that audio cues preceding such unpredictable motion may then reduce sickness ratings by 17%. We conclude that 1) unpredictability of motion increases motion sickness, which effect, 2) can be decreased by adding a cognitive cue preceding an otherwise unpredictable change of motion.
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