Binaural Beats are a type of Auditory Beat Stimulation first found in 1839 and recorded extensively in 1973
Many studies have been conducted, including the effect of binaural beats to reduce anxiety levels. They have also shown to improve memory and enhance mood- even to a state of bliss.
Binaural beats and isochronic tones alter connectivity between different regions of the brain in Theta, Alpha, Delta, and Beta frequencies.
Isochronic tones have a flickering, pulsating sound. This is because they are a frequency that is rapidly turned on and off like a signal. They have the same ability to alter brain states but are best for the beta state and do not rely on headphones to be received. They are audible by speaker.