Hypothetical neural stimulation for altering states of consciousness
Brainwave entrainment, also referred to as brainwave synchronization or neural entrainment, refers to the observation that brainwaves (large-scale electrical oscillations in the brain) will naturally synchronize to the rhythm of periodic external stimuli, such as flickering lights, speech, music, or tactile stimuli. As different conscious states can be associated with different dominant brainwave ... Wikipedia