## 3 Results
### Situational Awareness
#### 3.3.3 Eeg  
EEG is usually recorded simultaneously at multiple electrode sites in different locations on the scalp, which are spread across the frontal, temporal, parietal, and occipital regions of the brain. All EEG data were segmented and subjected to a fast Fourier transform, averaging them into six different frequency divisions: \(\delta\) (1-4 Hz), \(\theta\) (4-8 Hz), \(\alpha_{1}\) (8-10 Hz), \(\alpha_{2}\) (10-13 Hz), \(\beta_{1}\) (13-18 Hz), and \(\beta_{2}\) (18-30 Hz). Many non-neuroanatomical factors have adverse effects on the absolute power. In order to facilitate the comparison of the resting spontaneous EEG power among different categories of subjects and eliminate the influence of individual differences on the relative power, the ratio of each rhythm to the full frequency band, i.e., the relative power of each frequency band, was calculated in this work. Some studies have pointed out that although the relative power is greatly affected by noise, it still shows better performance than the absolute power. The relative power is measured as the ratio of each band's power to the total band power. The descriptive results for the relative power are shown in Table 1. After training, the relative power of the \(\theta\) and \(\alpha_{1}\) frequency bands was increased, while the other frequency bands remained unchanged. There was no significant change in the control group before and after training. The spectral topographic map shows the relative power of six frequency bands. In Figure 7, the data for each band in the two groups are normalized, and the color bar displayed below the figure is standardized within the range of 0 to 1, where red indicates higher activation. In the training group, the activation of the \(\alpha_{1}\), \(\alpha_{2}\) bands was more obvious; there was no significant difference in the control group. A 2 (training group, control group) \(\times\) 2 (pre-test, post-test) repeated-measures analysis of variance was conducted on the relative power of each frequency band, and the analysis \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Frequency Band**} & \multicolumn{2}{c}{**Training Group**} & \multicolumn{2}{c}{**Control Group**} \\ \cline{2-5}  & **Pre-Training** & **Post-Training** & **Pre-Training** & **Post-Training** \\ \hline \(\delta\) & 0.737 \(\pm\) 0.070 & 0.699 \(\pm\) 0.059 & 0.739 \(\pm\) 0.065 & 0.745 \(\pm\) 0.075 \\ \(\theta\) & 0.113 \(\pm\) 0.023 & 0.159 \(\pm\) 0.025 & 0.121 \(\pm\) 0.034 & 0.118 \(\pm\) 0.033 \\ \(\alpha_{1}\) & 0.046 \(\pm\) 0.017 & 0.051 \(\pm\) 0.012 & 0.047 \(\pm\) 0.018 & 0.043 \(\pm\) 0.012 \\ \(\alpha_{2}\) & 0.059 \(\pm\) 0.019 & 0.051 \(\pm\) 0.015 & 0.056 \(\pm\) 0.022 & 0.051 \(\pm\) 0.017 \\ \(\beta_{1}\) & 0.024 \(\pm\) 0.008 & 0.023 \(\pm\) 0.007 & 0.022 \(\pm\) 0.006 & 0.023 \(\pm\) 0.009 \\ \(\beta_{2}\) & 0.021 \(\pm\) 0.040 & 0.018 \(\pm\) 0.035 & 0.018 \(\pm\) 0.034 & 0.019 \(\pm\) 0.038 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Average of each frequency band before and after training. Figure 6: Comparison of differences in situational awareness before and after training. (**a**) SAGAT scale; (**b**) SART scale. results are shown in Table 2. The main effect of the \(\theta\) band grouping was not significant, but the measurement time and interaction were significant. Further simple effects analysis showed that the \(\theta\) relative power of the training group was significantly increased after training compared with that before training [F(1, 19) = 15.458, \(p\) < 0.001, \(\eta^{2}\) = 0.449], while the control group had no significant difference before and after training [F(1, 19) = 0.077, \(p\) = 0.785, \(\eta^{2}\) = 0.004]. The main effect edge of the \(\alpha_{1}\) band was significant, the measurement time edge was significant and the interaction was not significant. The main effect of the \(\alpha_{2}\) band group was significant, and the measurement time and interaction were significant.