Table 1 shows the good sensitivity and specificity values of KNN, and the highest Kappa value of 0.756 and an F-score of 0.878 confirm better performance in an eyes-open state. In an eyes-closed state, the highest Kappa value of 0.867 and an F-score of 0.935 confirm the best performance of KNN, as shown in Table 2. In the visual WM task, KNN obtained an excellent Kappa value of 0.956 and an F-score of 0.989 (Table 3). The sensitivity and specificity measures in the visual WM task validate the overall excellent performance of the classification model based on KNN.
