Patent US 6,409,655

A device for applying stimuli to a subject for therapeutic purposes utilizing an audio source producing a selected audio tone. An audio speaker delivers the audio stimulus to the left and right ears of the subject in an alternating manner, such that the sounds may be heard in either of the ears or may be heard in both of the ears in sequential fashion. Visual or tactile stimuli may be delivered to a subject singularly or simultaneously with the audio stimulus.