Table 1.

Extracted features derived in an epoch.

No.	Feature	Abbreviation	Description If Needed
1	minimum value	MINV	/
2	maximum value	MAXV	/
3	arithmetic mean	AMV	/
4	median value	MNV	$\begin{array}{l}{\mathrm{MNV}(\mathrm{N}:\mathrm{odd})=(\mathrm{x}}_{\frac{N+1}{2}}{\displaystyle )}\\ \mathrm{MNV}(\mathrm{N}:\mathrm{even})=\frac{1}{2}({\mathrm{x}}_{\frac{N}{2}}+{\mathrm{x}}_{\frac{N}{2}+1})\end{array}$
5	standard deviation	SD	/
6	variance	V	/
7	skewness	S	$\mathrm{S}=\frac{1}{\mathrm{N}-1}{{\displaystyle {\sum }_{\mathrm{n}=1}^{\mathrm{N}}\left[\right(\frac{{\mathrm{x}}_{\mathrm{n}}-\mathrm{AMV}}{\mathrm{SD}})}}^3{\displaystyle ]}$
8	kurtosis	K	$\mathrm{K}=\frac{1}{\mathrm{N}-1}{{\displaystyle {\sum }_{\mathrm{n}=1}^{\mathrm{N}}\left[\right(\frac{{\mathrm{x}}_{\mathrm{n}}-\mathrm{AMV}}{\mathrm{SD}})}}^4{\displaystyle ]}$
9	center frequency [26]	fc	/
10	bandwidth	fσ	/
11	power spectral density of center frequency	pfc	/
12	gamma rhythm	γ	density at 25~40 Hz
13	beta rhythm	β	density at 13~25 Hz
14	alpha rhythm	α	density at 8~13 Hz
15	theta rhythm	θ	density at 4~8 Hz
16	delta rhythm	δ	density at 1.5~4 Hz
17	K complex	Kc	density at 0~1.5 Hz
18	fuzzy entropy	FUEN 1	refer to [27]
19	sample entropy	SampEN 2	refer to [28]
20	multiscale entropy	MSES 3	refer to [29]

¹ FUEN parameters: r = 0.3, n = 2, m = 2 SD; ² SampEN parameters: m = 2, r = 0.2 SD; ³ MSES parameters: τ = 11, m = 2, r = 0.15 SD.