Spectral Asymmetry and Higuchi’s Fractal Dimension Measures of Depression Electroencephalogram

Figure 2

The scheme of SASI method: an EEG spectrum (black line) and a parabolic approximation (green line); 𝑓_𝑐—the maximum of parabolic approximation; 𝑓₁ and 𝑓₂—lower and higher boundary frequencies of the lower EEG frequency band; 𝑓₃ and 𝑓₄—lower and higher boundary frequencies of the higher EEG frequency band.