Brainwave entrainment or "brainwave synchronization," is any practice that aims to cause brainwave frequency to fall into step with a periodic stimulus having a frequency corresponding to the intended brain-state - for example, to induce sleep, creativity, meditative states etc.
Scientific research has provided convincing evidence that advanced meditators develop the ability to use their whole brain and live in a more balanced state that physiologically is the result of brain synchronization and whole brain functioning.
However, at the current stage of evolution of the "average" or "normal" human brain - the "left brain" and the "right brain" do not communicate easily or much at all.
So the average person's brain is just not balanced, i.e. the different centres of the brain literally do not - frequently cannot - communicate.
The same is also true for the "the emotional centre" and "the reptile brain" or the survival instinct).
This lack of brain balance, is the underlying evolutionary and neurological reason why we experience life the way we do and why we suffer so much, and as a species why we inflict so much suffering on each other.
It is also the root cause of all of our personal internal conflict and inner resistance or immunity to change.
So improved and more frequent and conscious communication between these different brain centres is the route to peace, insight and all the benefits attributed to meditation.
Dr. Charles Stroebel, Ph.D., M.D. Director of the Institute for Advanced studies in behavioural medicine, carried out a sequence of experiments on meditators in the 1970s.
He discovered that during stages of deep meditation the brain wave patterns of meditators altered and both hemispheres of the brain were working in harmony together.
When these same people were not meditating, one hemisphere was alternately dominant over the other and they were not working in harmony.
In October 1973 a breakthrough report "Auditory Beats in the Brain" by Dr. Gerald Oster of the Mt. Sinai Medical Center was published in the Scientific American.
It explained, that when tones of different frequencies were presented separately to each ear, pulsation's called binaural beats occurred in the brain.
This resulted in the whole brain becoming "entrained" to the internal beat and resonating to that frequency.
So in essence what this discovery revealed is that when our brainwave patterns are subject to binaural beats the brain can be entrained in a variety of ways that can positively affect moods, creativity, memory capacity, "brain balancing" and other
Around the same time Robert Monroe of the Monroe Institute of Applied Sciences was also studying binaural beats.
In countless experiments, using an EEG machine to observe the subject's electrical brain wave patterns, Robert Monroe confirmed that he could without a doubt entrain brain wave patterns using binaural beats.
He also noted that the response did not only occur in the area of the brain accountable for hearing, or only in one or the other of the hemispheres, but rather the whole brain resonated, the wave forms of both hemispheres becoming identical in frequency, amplitude, phase, and coherence. Many other researchers have also verified this phenomenon.