A Hybrid EMD-Wavelet EEG Feature Extraction Method for the Classification of Students’ Interest in the Mathematics Classroom

Table 1

The corresponding frequency obtained using db4 for 5 decomposition levels.

Level	Wavelet coefficients	Frequency (Hz)	EEG rhythms	EEG frequency (Hz)
1	Dj=0	62.5–125	—	—
2	Dj=1	31.25–62.5	Gamma	>30
3	Dj=2	15.62–31.25	Beta	13–30
4	Dj=3	7.81–15.62	Alpha	8–12
5	Dj=4	3.91–7.81	Theta	5–7
5	Aj=4	1.91–3.91	Delta	<4