An EEG neurofeedback and total evoked brain activity measurement methods utilize minimum ambient EEG activity as stimulant frequencies. A method of using repetitive stimulation in conjunction with EEG neurofeedback protocols is described. Electrodes, attached to a subject's scalp, transmit electroencephalographic (EEG) signals from the subject. These signals are in response to the visual and/or auditory stimuli being displayed to the subject. The resultant EEG signals are then filtered at pre-defined frequencies or frequency bands. The output from the filtered EEG signals is then analyzed and monitored for short-term state changes. The invention also uses flicker stimulation, real-time signal filtration and feedback, feedback during audio and visual stimulation derived from filtered outputs, and fundamental and integral harmonics in combination with total evoked response.