Table 21.

Complexity features.

Category	Description	Articles
Entropy	Auto mutual information	[42, 140, 144, 146, 162]
	Epoch-based entropy	[93]
	Fuzzy entropy	[110, 140]
	Multiscale entropy	[146, 170]
	Multivariate multiscale entropy	[80]
	Quadratic sample entropy	[108]
	Sample entropy	[92, 96, 137, 140]
	Shannon entropy	[93, 146, 162]
	Spectral entropy	[100, 140, 146]
	Tsallis entropy	[146, 162]
	Wavelet entropy	[92]
Other	Bispectrum analysis	[122]
	Central tendency measure	[140]
	Correlation dimension	[93]
	Distance-based LempelZiv complexity (dLZC)	[109]
	Hjorth activity, mobility, and complexity	[137, 178]
	Lempel-Ziv complexity	[102, 137, 140]
	Visibility graphs	[126]
	Wavelet compression coefficients	[132]