Some scientists claim that we can hear sounds at frequencies lower than 20Hz, the truth is that we don’t really hear them but when these sounds are present our brains will react to them. They are not usually audible, possibly when played very loudly, but binaural beats have been produced in the brain that were below 20Hz during experiments. In order to match the brain waves, all binaural beats are produced at less than 40Hz.
There are five brain wave frequencies in the human brain and each frequency will correspond to a particular level of consciousness. The exact frequencies will be a little different for each individual. Because of that the binaural beat provides a range within the five frequencies to compensate. Following are the ranges and the state of mind affected:
Delta, 4HZ or less
The deepest state of awareness, one in which we don’t dream and lose all our sense of awareness. If you want to have a deeper and better sleep, use binaural beats in this range. If you listen to these just before, or even in bed, you will have a deep and restful sleep.
Theta, between 4Hz and 7Hz
This is the state that can be reached with deep meditation. Lucid dreaming is accomplished at this level as the subconscious mind is in partial control, but we are conscious enough that we can control our actions during our dreams. This state of mind is also where the mind can to some extent influence healing of the body or even the mind.
Alpha, between 7Hz and 13Hz
This is that floating, sleepy, relaxed state that we feel just before we fall asleep. It is also the state where we meditate and are able to relive ourselves of all the stress that is a part of most of our lives these days. This state can re-energize you and get you relaxed and ready for another day.
Beta, from 14HZ to 35Hz
If you are busy, active, problem solving, or thinking anxious thoughts, then you are currently in the beta state of mind. If you would like to increase your problem solving or learning abilities then you should listen to binaural beats in this frequency range. The beats in this frequency range will greatly enhance your learning potential.
Gamma, greater than 40Hz
In this state we are at the highest mental activity and we use these brain waves for much of our day. Generally, unless you feel run down and lethargic, we do not need to increase the time that we spend in this state.
The brain will be affected by one of these frequencies when listening to binaural beats. What you need to do is select the best frequency for the results that you desire. For instance, if you want to improve your relaxation, use beats in the alpha range. If you want to be more alert you need to play binaural beats in the beta range. Play beats in the delta range for a good nights sleep
A university study was done to show how different binaural beats played at different frequencies could change the brain responses to certain stimuli. One group was played binaural beats in the beta frequency range and the other listened to delta frequencies. After the binaural beats were played, it was found that the listeners of the beta range were much more alert and awake than those that listened to the delta binaural beats.
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