Coupled Audio-Visual Sensory Stimulation(C.A.S.S.). Using headphones and LED glasses, light and sound are transmitted simultaneously to stimulate and enhance Gamma brain rhythms at a 40Hz frequency for a duration of 1 hour. 40Hz light and sound has been shown to stimulate areas of the frontal cortex involved in higher cognitive function.
Opaque glasses are used to block out extraneous light and two white 25 degree LED's provide light stimulation using a square wave with a duty cycle ratio of 50/50, which has been shown to more strongly entrain brain rhythms through the frequency following response.
The light is reflected onto a screen which flickers at 40Hz. The LED's provide light stimulation that has been shown to activate areas of the frontal cortex and it is thought that there may be a synergistic effect of combining this light spectrum with the 40Hz flicker stimulation.
Cool White LED with peak spectrum of 460-465nm/Blue enriched light: