Brainwave Entrainment
Brainwave entrainment has been around for as long as mankind has. In a way, it is the way our brains respond to our environment. Our brains respond to sensory stimuli with what’s called a cortical evoked response. The cortical evoked response looks something like this:
Brainwave entrainment occurs as a response to any rhythmic stimulus, such as flickering light or pulsating sound. It is very likely that this is the reason why a flickering fire has such a calming, hypnotic effect or why the beating of drums evokes such a powerful emotional response.
The ability to measure and study brainwave patterns has given us an intellectual understanding of what we already knew intuitively: external stimuli have a effect on us. When you rock a baby to sleep, you are intuitively evoking a sleep pattern cortical response in an infant. When you go to a disco, the flashing lights and thumping rhythms evoke another kind of response.
Brainwave entrainment occurs through a process called the frequency following response. Given a specific frequency, the brain will follow it and become entrained to the frequency. When a targeted frequency is played, the brain will entrain to or match it. The result will be an altered state of consciousness. If you entrain to a fast frequency, your brain activity will speed up. If you entrain to a slow frequency, your brain activity will slow down. This can happen very quickly, as is illustrated below.
As you can see, it can begin to happen very quickly. The reason why brainwave entrainment sessions usually last between a half an hour to an hour is because it takes time to descend to the very slow frequencies. In our normal waking state, our brains are operating at a fairly high frequency. In order to bring the brain down to a very slow frequency, such as that associated with dreams and lucid dreams, it takes a little time.
The cortical evoked response is natural and universal, as is the frequency following response. This is why brainwave entrainment can work on anybody. If it doesn’t, it may be necessary to experiment with different brainwave entrainment “vehicles.” While binaural beats are the best known, they are not the most effective for everybody. Isochronic beats produce a far more powerful response in the brain and are therefore often more effective.
