NeuroScore Z-ratio Definition and Calculation
The Z-Ratio calculates the difference in low frequency power (LF: 0.5-8Hz) to high frequency power (HF: 8-20Hz) in relation to the total available power. The result is in a range from -1 to 1 where -1 indicates high frequency power concentration and 1 indicates low frequency power concentration.
The equation that is used for this calculation is:
Z-ratio = (LF-HF)/(LF+HF)
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