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Brainwave entrainment
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<p>Brainwave entrainment, also referred to as brainwave synchronization or neural entrainment, refers to the observation that <a href="/facts/Neural_oscillation/knHbTaxg">brainwaves</a> (large-scale electrical oscillations in the brain) will naturally <a href="/facts/Synchronization/L39sYwbr">synchronize</a> to the rhythm of periodic external stimuli, such as flickering lights, speech, music, or tactile stimuli. </p><p>As different conscious states can be associated with different dominant brainwave frequencies, it is hypothesized that brainwave entrainment might induce a desired state. Researchers have found, for instance, that acoustic entrainment of delta waves in slow wave sleep had the functional effect of improving memory in healthy subjects. </p>