# A New Training Method for VR Sickness Reduction
## 4 Conclusions  
In this paper, a new approach for reducing VR sickness, a user training method, was proposed. The proposed method trains users for VR sickness in advance, unlike existing methods that apply reduction methods to VR content. To achieve this, the VR \begin{table}
\begin{tabular}{c c c c} \hline \hline  & \multicolumn{3}{c}{**VR Sickness Response**} \\ \cline{2-4}
**Subject** & **Pre-Experiment** & **Post-Experiment** & **Increase and** \\  & **Pre-Experiment** & **Post-Experiment** & **Decrease** \\ \hline S1 & 0.62 & 0.56 & Decrease \\ S2 & 0.00 & 0.13 & Increase \\ S3 & 0.03 & 0.07 & Increase \\ S4 & 0.90 & 1.23 & Increase \\ S5 & 0.37 & 0.43 & Increase \\ S6 & 0.00 & 0.00 & Maintain \\ S7 & 1.50 & 0.88 & Decrease \\ S8 & 2.47 & 0.37 & Decrease \\ S9 & 0.00 & 0.00 & Maintain \\ S10 & 0.00 & 0.03 & Increase \\ S11 & 0.13 & 0.17 & Increase \\ S12 & 0.77 & 0.87 & Increase \\ S13 & 0.77 & 0.50 & Decrease \\ \hline Average & 0.58 & 0.40 & - \\ \hline Rate (\(p\)-Value) & \multicolumn{2}{c}{\(-\)31.03\% (0.48)} & - \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Pre-experiment and post-experiment VR sickness response results. Figure 8: The analysis results with respect to VR sickness responses between two groups (increase and decrease groups). sickness reduction training and VR training content were developed by analyzing existing studies related to VR sickness and motion sickness. The VR sickness reduction training is conducted three times at 48 h intervals, and the VR training content was developed with separate levels to provide users with gradual VR sickness stimulation. In addition, a total of seven VR sickness factors (camera movement speed, scene complexity, fixed objects, moving objects, FoV, movement latency, screen resolution) were included in the VR training content to enable users to adapt to various stimuli. An experiment was conducted with 13 subjects to examine the feasibility of the proposed training. The subjects' VR sickness was measured using an SSQ questionnaire and VR sickness response. Out of the 13 subjects, 2 subjects could not complete both the pre- and post-experiment sessions due to VR sickness. Therefore, data from these two subjects were included up to the point where they stopped. As a result, we confirmed a decrease of at least 20% in all four categories of the SSQ in the post-experiment session. The nausea score (47.83%, \(p\) = 0.04) and oculomotor discomfort score (34.29%, \(p\) = 0.02) significantly decreased, while the disorientation score (19.98%, \(p\) = 0.47) and total score (32.40%, \(p\) = 0.12) did not show significance. The proposed training content provided a view based on the user's head movements, whereas the experimental one included intentional camera rotations to sufficiently induce VR sickness in users. Therefore, it is considered that the disorientation score was not significant because the subjects were not trained for unexpected changes in view due to intentional camera rotation. Additionally, to further analyze the two non-significant categories (disorientation and total score), we compared the pre- and post-experiment results for each subject individually. Through this, it was confirmed that the subjects with higher disorientation and total scores in the pre-experiment demonstrated a greater reduction in VR sickness following the proposed training. The VR sickness response decreased by 31.03% from the pre- to the post-experiment stages; however, this was not statistically significant. Therefore, we divided the subjects into decrease and increase groups to analyze the trends. The pre-experiment VR sickness response in the decrease group was 1.03 times higher than that in the increase group. As a result of the post-experiment session, it was confirmed that the decrease group had decrease in VR sickness response by an average of 0.76 times and the increase group increased by an average of 0.11 times. This means that the subjects who frequently experienced VR sickness experienced less VR sickness through the proposed training.