The earliest mention of photic stimulation actually dates back many centuries with the mention of spinning light wheels. Early in the 20th century scientists developed the first EEG instruments sensitive enough to measure the minute electrical brainwave activity. Soon after the discovery of brainwaves, early experiments determined that these patterns could be altered by strobes of light blinking in the brainwave frequency range.
Dr. William Kroger was the first to publish results on the use of photic stimulation after testing Sidney Schneider's device pictured above. These devices were manufactured from 1959 through 1974 and were several times more expensive than today’s modern devices.
For additional information on the background of auditory visual stimulation, please refer to this excellent article located on the following website: http://www.brainwavesounds.com/emily_lit_review.html
The science of auditory and visual stimulation
Auditory and visual stimulation (AVS) is a method of personal development that has evolved over more than two decades from the study and use of biofeedback; a training procedure that can enable a person to alter physiological responses to induce a desired state of mind.
However, the application of AVS is quite distinct from biofeedback. In biofeedback, the object for the individual is to deliberately try to calm or train mental activity. With AVS, passive inducement occurs without the conscious effort of the individual. The frequencies of light and sound can be utilized for relaxation or stimulation purposes without the side-effects associated with other common approaches.
How AVS works
The induction into higher arousal states induced by higher frequencies of our special, broad-spectrum white LED lights is theorized to provide enhanced mental activity, which can result in cognitive improvement. The induction to lower states of mental activity through specific lower frequency rates has been found to reduce feelings of anxiety and stress thereby promoting feelings of calmness and deep relaxation, allowing the mind to operate more efficiently with greater clarity.
How AVS technology is applied
Auditory and visual stimulation is introduced primarily through the optic nerve and ears by means of computerized technology. This technology is applied to the individual through the use of specially designed glasses inset with light-emitting diodes (LEDs) set at specific angles and distances from the eye to optimize desired effect.
These lights flash at predetermined frequencies, and are coupled with specific tones that are received through headphones. The light emitting from the glasses and rate of the flicker introduced by way of the optic nerve creates a matching effect, or induction, between the mind and the set rate of flickering, thereby moving the mind to either more energetic or into deeply relaxing states. Frequencies are determined by the preferred outcome.
Frequency Following Response
The induction method by which this occurs is known as Frequency Following Response (FFR). Through this natural response mechanism, the mind matches the corresponding visual and auditory stimulus. Two common examples demonstrating a typical relaxation response are when gazing into a gently flickering flame, or the effect of soothing music upon the listener.
A Brief Background of Photic Stimulation

The World's First Commercial Brainwave Synchronizer, circa 1958-1970

The Brain Wave Sychronizer Photic Stimulator in action

The Journal of the American Medical Association published an article for the first time on the Brain Wave Synchronizer in March, 1959.
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