Sound Entrainment & Brainwave Entrainment Everything about being alive involves rhythm—from our heartbeat and breathing to the electrical activity of our brain. Entrainment happens when one rhythm begins to synchronize with another. Brainwave entrainment explores how rhythmic stimulation, including sound, may influence patterns of brain activity. Binaural beats are one technique studied for this purpose. When two slightly different tones are delivered separately to each ear,