## 4 Discussion  
In this study, the effectiveness of the working memory training process was investigated through the performance of the double-dimensional N-back training task. Similarly to previous research, it was found that the working memory capacity is malleable, and the most direct evidence of the plasticity of working memory comes from the direct training performance [20].  
An improvement in working memory capacity is an important manifestation of enhanced working memory abilities, which is consistent with the results of previous, similar studies [12]. In terms of task performance, there was no improvement in the accuracy rate of the training group compared with the control group. The reason that the training effect did not transfer to the accuracy rate was probably the simplicity of the shearer monitoring task, and the accuracy rate had almost reached the maximum before training. In terms of the reaction time, working memory training effectively improves individuals' inhibitory control and attention transfer abilities, thereby reducing their reaction times, which has been shown in previous studies [21]. In terms of the SA scale, the subjective SART data showed that the interaction between the group and the measurement time was not significant, and the lack of consistency with previous results may be due to the fact that the participants could not accurately recognize their own states [22]. The objective SAGAT scale results showed that the SAGAT scores of the training group were significantly higher than those of the control group after training, indicating that the working memory training also had a positive impact on SA during the monitoring of the shearer. Previous studies have confirmed the strong relationship between working memory as measured by the SAGAT and SA [23]. In addition, EEG indicators showed the significant activation of the \(\theta\), \(\alpha_{2}\), and \(\beta_{1}\) relative power after training. According to previous studies, the \(\theta\), \(\alpha_{2}\), and \(\beta_{1}\) bands are related to situational awareness and have the potential to characterize SA [24].  
This study also concludes that working memory training can prevent the failure of situational awareness, and several factors may be related to it. [PERSON]'s information processing theoretical model emphasizes that attention and working memory are the key influencing factors that restrict individuals' access to SA [5]. The dual-dimensional N-back task involves multiple execution processes [25], including paying attention to the rational allocation of resources, the rapid updating and storage of memory information, monitoring the dual-task process at the same time, and inhibiting interference from irrelevant information. In addition, the brain has plasticity [26], which means that working memory training can prevent the failure of situational awareness and effectively improve the SA levels of individuals. In conclusion, the similar basic cognitive processing between working memory and SA and the adaptability of the working memory capacity are two important factors for the transfer of working memory training's effects to SA.  
Nevertheless, there were some shortcomings in this study. First, due to the time limit during the training, the final time of the training effect is not clear at present. Secondly, there are many means of SA detection; each has its own advantages and disadvantages, and the emphasis of each method may be different. The methods selected in this study may not be complete, and more methods need to be selected to compensate for this. Third, the interval before and after the experiment was short, no long-term follow-up has been conducted, and the sustainability of the improvement in situational awareness needs further observation. These conclusions are for reference only.