Viewing environment is an important factor to understand the mechanism of visually induced motion sickness (VIMS). In Experiment 1, we investigated whether the symptom of VIMS changed depending on viewing angle and physical display size. Our results showed that larger viewing angle made the symptom of sickness severer and nausea symptom changed depending on physical display size with identical viewing angles. In Experiment 2, we investigated effects of viewing angle and amplitude of oscillation. The results showed that the effects of viewing angle were not only related to amplitude of oscillation but also to the other factors of viewing angle.

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While visual size preferences regarding still objects have been investigated and linked to the "canonical size" effect-where preferred on-screen size was significantly related to objects' real-world size-the visual size preferences related to moving images of natural scenes has not been researched. In this study, we measured the preferred size of moving images of natural scenes and short duration and investigated the effect of viewing distance on size preferences. Our results showed that the preferred size varied strongly depending on content, and we found moving images' canonical size effect. The preferred size in images of scenery was significantly larger than in images of persons, and there was a positive correlation between the preferred size and the real-world physical size of the main subjects in the images. When the viewing distance was doubled, the preferred size increased about 10% as a ratio to screen size-in contrast to the findings of a previous study. While the rationale for these findings is not yet clear, our analysis suggests that neither the motion component in the images nor the nature of their background area are contributing factors. We suggest that environment, viewing distance, and screen size may contribute to this effect.

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