TABLE 2.

Thirty power spectrum density (PSD) feature sets constructed by combining different frequency bands and the number of features for each feature set. Fifty features were extracted for each frequency band.

Frequency bands	The number of features
D, T, A, LB, HB, G	50 ROIs × 1 frequency band = 50
D + T, D + A, D + LB, D + HB, D + G, T + A, T + LB, T + HB, T + G, A + LB, A + HB, A + G, LB + HB, LB + G, HB + G	50 ROIs × 2 frequency bands = 100
D + T + A, T + A + LB, A + LB + HB, LB + HB + G	50 ROIs × 3 frequency bands = 150
D + T + A + LB, T + A + LB + HB, A + LB + HB + G	50 ROIs × 4 frequency bands = 200
D + T + A + LB + HB	50 ROIs × 5 frequency bands = 250
D + T + A + LB + HB + G	50 ROIs × 6 frequency bands = 300

D, delta; T, theta; A, alpha; LB, low-beta; HB, high-beta; G, gamma.