Providing an indication of a state of awareness for a patient includes a receiver configured to acquire an EEG signal a first bandpass filter coupled with the receiver and configured to filter the EEG signal to generate a first signal in a first frequency band and a second bandpass filter coupled with the receiver and configured to filter the EEG signal to generate a second signal in a second frequency band. Also included are a mixer coupled with the first and second bandpass filters and configured to combine the first signal and the second signal to produce a combined signal and a visual display screen configured to display the combined signal.
