## 4 Experiment Results and Data Analysis
### Eye-Tracking-Data Analysis
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**FPV**} & \multicolumn{2}{c}{**Scene 1**} & \multicolumn{2}{c}{**Scene 2**} & \multicolumn{2}{c}{**Scene 3**} & \multicolumn{2}{c}{**Scene 4**} \\ \cline{2-9}  & **ROI\_A** & **ROI\_B** & **ROI\_A** & **ROI\_B** & **ROI\_A** & **ROI\_B** & **ROI\_A** & **ROI\_B** \\ \hline Average & 61.137 & 53.003 & 53.218 & 43.762 & 50.285 & 42.683 & 52.141 & 41.349 \\ Std & 20.062 & 23.699 & 22.902 & 18.168 & 16.526 & 17.115 & 15.347 & 12.518 \\ t-test & t(29) = 2.376 & t(29) = 2.284 & t(29) = 2.178 & t(29) = 3.345 \\ \(p\)-value & 0.024 & 0.030 & 0.038 & 0.002 \\ Cohen’s d & 0.370 & 0.457 & 0.450 & 0.770 \\ Average (Sele\_A) & 65.057 & 48.197 & 68.975 & 41.640 & 54.8534 & 35.779 & 65.7071 & 43.997 \\ Std (Sele\_A) & 21.458 & 26.514 & 29.388 & 7.320 & 17.579 & 15.588 & 14.582 & 8.400 \\ t-test (Sele\_A) & t(14) = 3.661 & t(5) = 2.603 & t(14) = 4.512 & t(8) = 3.561 \\ \(p\)-value (Sele\_A) & 0.001 & 0.024 & 0.000 & 0.004 \\ Cohen’s d (Sele\_A) & 0.699 & 1.276 & 1.148 & 1.824 \\ Average (Sele\_B) & 56.232 & 64.214 & 43.844 & 57.257 & 45.551 & 49.314 & 39.193 & 53.507 \\ Std (Sele\_B) & 15.411 & 16.056 & 17.754 & 21.942 & 11.067 & 13.758 & 6.446 & 13.878 \\ t-test (Sele\_B) & t(7) = \(-\)2.034 & t(5) = \(-\)1.835 & t(5) = \(-\)2.487 & t(6) = \(-\)2.768 \\ \(p\)-value (Sele\_B) & 0.040 & 0.063 & 0.028 & 0.016 \\ Cohen’s d (Sele\_B) & 0.507 & 0.672 & 0.301 & 1.322 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Statistical analysis of fixation-point variance (FPV) for four scenes in both tests. Figure 5: Example of eye-gaze trajectories for Scenes (**a**) 1, (**b**) 2, (**c**) 3, and (**d**) 4. In the four scenes, fixation points were more dispersed in Texture A than in Texture B. In the four scenes, Texture A contained dispersed fixation points because participants paid more attention to its global features (horizontally similar to Texture S). The horizontal displays were easier to process, which subsequently led to higher choice quantities [36; 39]. Therefore, we hypothesized that the final similarity choices and the FPVs in ROIs (especially for Textures A or B) were highly related. That is, if the FPV in Texture A was larger than that in Texture B, the final similarity choice tended to be Texture A; by contrast, if the FPV in Texture A was smaller than that in Texture B, the final similarity choice tended to be Texture B. To verify this hypothesis, we conducted a paired t-test to verify differences between choices (Textures A and B) on the basis of the FPVs in Textures A and B (shown in Table 1). The independent variable used in the t-test was the FPVs in ROIs under a certain final similarity choice (Texture A or B). Analysis results showed that, for Scene 1, the FPV in Texture A was significantly greater (in the paired t-test, t(14) = 3.661, \(p\) = 0.001) than that for Texture B when the similarity choice was Texture A under the significance level of 0.01. The FPV in Texture B, on the other hand, was not significantly greater (in the paired t-test, t(7) = \(-\)2.034, \(p\) = 0.040) than that for Texture A when the choice of similarity was Texture B. For Scene 2, the FPV in Texture A was not significantly greater (in the paired t-test, t(5) = 2.603, \(p\) = 0.024) than that for Texture B when the choice of similarity was Texture A. The FPV in Texture B was also not significantly greater (in the paired t-test, t(5) = \(-\)1.835, \(p\) = 0.063) than that for Texture A when the choice of similarity was Texture B. For Scene 3, the FPV in Texture A was significantly greater (in the paired t-test, t(14) = 4.512, \(p\) = 0.000) than that for Texture B when the choice of similarity was Texture A. However, the FPV in Texture B was not significantly greater (in the paired t-test, t(5) = \(-\)2.487, \(p\) = 0.028) than that for Texture A when the choice of similarity was Texture B. For Scene 4, the FPV in Texture A was significantly greater (in the paired t-test, t(8) = 3.561, \(p\) = 0.004) than that for Texture B when the choice of similarity was Texture A.