Brainwave synchronization, commonly referred to as "brainwave entrainment," is the practice of entraining one's brainwaves to a desired frequency, by means of a periodic stimulus with corresponding frequency. The stimulus can be aural as in the case of binaural beats, monaural beats, and isochronic tones (as with OptiMindzation), visual, as with a dreamachine, a combination of the two with a mind machine, or even electromagnetic radiation.

Brainwave entrainment, also known as "brainwave synchronization", is concerned with frequency following response, a naturally occurring phenomenon where the human brain has a tendency to change its dominant EEG frequency towards the frequency of the dominant external stimuli applied to it.

Brainwave entrainment has many historical, and often social, manifestations. Drum circles, chanting, and staring at a fire were all ways that our ancestors partook in the phenomenon.

Brainwave synchronization is said to help 'synchronize the two hemispheres of the brain'. It is also a private case of functional brain connectivity concept, whereas functional connectivity is defined as the temporal correlation between spatially-remote neurophysiological events, expressed as deviation from statistical independence (temporal correlation) across these events in distributed neuronal groups and areas, which produce the brainwaves. sited from wikipedia.org

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