Disclosed is a system comprising a microcomputer (18), a user input device (24), a graphics display (20), a hard copy output device (22), a method to derive a diagnostic index indicative of a selected cerebra l phenomena which obtains (19) unipolar EEG signals in an acquisition, and an analysis system (12) from regions of interest on both th e left and right hemispheres of the brain of a subject (15). The system uses high gain low noise amplifiers to maximize the dynamic range for low energy wave components of the signals. Band-pass filtering is used to reduce noise and to avoid an alias. The system applies commonly used digital signal processing (DSP) techniques to digitize, to low pass filter (100Hz), and to decimate the signals. Power spectral, bi-spectral, and higher order spectral processing is then performed.
CEREBRAL BIOPOTENTIAL ANALYSIS SYSTEM AND METHOD