Table 1.

List of electroencephalogram (EEG) features evaluated in the present study.

Feature	Mathematical Expression
Power Spectral Density (PSD) 1	$\frac{1}{N}{\displaystyle \sum _{n=1}^N}x\left(n\right)e^{-i2\pi fn/N}$
Differential Asymmetry (DASM)	Difference between PSDs of interhemispheric electrode pairs
Rational Asymmetry (RASM)	Ratio between PSDs of interhemispheric electrode pairs
Hjorth Parameters 2 [30]	$\mathrm{Activity}\left(x\right)=\frac{1}{N}{\displaystyle \sum _{\mathrm{i}=1}^N}{\left(x_{\mathrm{i}}-{\mu }_x\right)}^2$
	$\mathrm{Mobility}\left(x\right)=\sqrt{\frac{\mathsf{\sigma }(x\prime )}{\mathsf{\sigma }\left(x\right)}}$
	$\mathrm{Complexity}\left(x\right)=\frac{Mobility\left(x\prime \right)}{Mobility\left(x\right)}$
Shannon Entropy 3 [31]	$-{\displaystyle \sum _{\mathrm{i}=1}^N}p(x_{\mathrm{i}})\ln p\left(x_{\mathrm{i}}\right) , where {\displaystyle \sum _{\mathrm{i}=1}^N}p(x_{\mathrm{i}})=1$
Hurst Exponent 4 [32]	$\log \left(R/S\right)/\log \left(N\right)$
Kolmogorov Complexity 5 [33]	c(n)/b(n)
Higher-order Cumulants 6 [34]	$E\left[X\left(k\right)X\left(k+m\right)X\left(k+n\right)\right]$
Common Spatial Pattern 7 [35]	$f_p=\log \frac{var\left(Z_p\right)}{{{\displaystyle \sum }}_{i=1}^{2m}var\left(Z_i\right)}$, where p = 1 to 2m

¹x represents the EEG time-series data and N indicates the length of data. ² x represents the EEG-time series data, ${\mu }_x$ represents the mean of x, x’ represents the derivative of x, and $\sigma \left(x\right)$ represents the standard deviation of x. ³ x represents the EEG time-series data. ⁴ N is the length of the sample of data, R is the difference between the maximum deviation from the mean and the minimum deviation from the mean, and S is the standard deviation. ⁵ n is the length of the time series data and b(n) is the ratio between n and log(n). ⁶ X(n) is the Fourier transform of the signal x(n) and E[·] stands for the expectation operation. ⁷ Z_p indicate the spatially filtered EEG signals associated with the largest p eigenvalues of sum of covariance matrix. More details can be found in [35]. Note that the value of p was set to 2 in this study.