The analog signal comprises a microvoltage time series of the EEG, sampled digitally and sampling rates adequate to over-sample the signal (using the Nyquist principle of exceeding twice the highest frequency being detected).
Where a = scaling; b = time QEEG has been accepted for diagnostic evaluation in some areas, such as cerebro-vascular disorders, encephalopathy, dementia and epilepsy, though it remains yet to be accepted in other clinical areas, such as diagnosing mild traumatic brain injury or psychiatric disorders.
[2] QEEG has also been utilized to provide neurofeedback, which is a form of biofeedback, wherein electrical activity in the brain is monitored by a computer program, which is applied to modulate visual or auditory stimuli—these stimuli, in turn, are designed to be controlled by the user.
Quantitative spectral analysis of EEG in psychiatry revisited: drawing signs out of numbers in a clinical setting.
CFC delta-beta is related with mixed features and response to treatment in bipolar II depression.