A persons ear can only hear a specific selection of sounds. Take a dog whistle for instance , your dog can hear it from a long distance but you cannot hear this at all. That is because the pitch of the whistle is higher than we are able to listen to.
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The human ear can hear seems from 20Hz to 20, 000Hz. Binaural beats are created at 40Hz or less and usually will never be heard unless played very fully.
Some scientists claim that we can listen to sounds at frequencies lower than 20Hz, the truth is that we don’t really listen to them but when these sounds can be found 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. To be able 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 regularity will correspond to a particular level of awareness. The exact frequencies will be a little various for each individual. Because of that the binaural beat provides a range within the 5 frequencies to compensate. Following are the ranges and the state of mind affected:
Delta, 4HZ or less
The deepest condition of awareness, one in which we all don’t dream and lose most our sense of awareness. If you want a deeper and better sleep, use binaural beats in this range. If you listen to these just before, and even in bed, you will have a deep and restful sleep.
Theta, between 4Hz and 7Hz
This is the state that can be arrived at with deep meditation. Lucid dreaming is accomplished at this level as the subconscious mind is in partial manage, but we are conscious enough that people can control our actions throughout our dreams. This state of mind is also where the mind can to some extent impact healing of the body or even the thoughts.
Alpha, between 7Hz and 13Hz
This is that floating, sleepy, comfortable state that we feel just before we fall asleep. It is also the state where we all meditate and are able to relive yourself of all the stress that is a part of the majority of our lives these days. This state can re-energize you and get you relaxed plus ready for another day.
Beta, from 14HZ to 35Hz
If you are busy, energetic, problem solving, or thinking stressed 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 rate of recurrence range will greatly enhance your learning potential.
Gamma, greater than 40Hz
Within this state we are at the highest psychological activity and we use these brain waves for much of our time. Generally, unless you feel run down plus 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