Before revision:  Moreover, the classification standard deviation for nine different subjects achieved the lowest value of 5.5 for the 2b dataset and 7.1 for the 2a dataset, validating that the proposed method is highly robust.
After revision:  Moreover, the classification standard deviation for nine different subjects achieved the lowest value of 5.5 for the 2b dataset and 7.1 for the 2a dataset, which validates that the proposed method is highly robust.