A method of reducing undesirable brain wave pattern using selective photic stimulation. Electrodes, attached to a subject's scalp, transmit electroencephalographic (EEG) signals from the subject. These signals are in response to the photic stimulation being displayed to the subject. The resultant EEG signals are then filtered, while control logic monitors a predetermined EEG frequency band and feeds back the filtered EEG signal to the subject via the photic stimulation. The photic stimulator is then turned on and off rapidly, in response to the amount of energy in a predetermined band of the subject's EEG, with the intent of reducing an undesirable brain rhythm.