Figure 4.

Spatial distribution of selected EEG features extracted from clinical EEG data when a vote threshold was 90 for the two feature selection approaches (outside of CV vs. within CV). Upper row and bottom row represent the spatial distributions of features selected by the outside of CV method and within CV method, respectively. Black lines represent the same features selected by the both feature selection approaches. Red and blue lines indicate the features selected by the within CV method more than and less than 50 times during 10 × 10 CV, respectively, but not selected by the outside of CV method at all.