There are scientific methods that can be used to change the sates of the human brain. Binaural beats are one of famous method of doing it. The basic thing that is doing in here is proving an audio tone that has a particular frequency which is in brain wave frequency range of a particular brain state. For example lets think your brain is in Beta state. You need to go to Alpha state to get relaxed your self. What you can do is provide your brain an audio tone which is in the range of 8Hz-14Hz. But It will not be work. Because human ears will not here the audio tones that are below 20Hz. The sensitivity range of the human ears is between 20Hz and 20000Hz. So how you can provide a tone below 14Hz frequency to your brain? Then you have to use binaural beats. Following picture provides you a clear idea on that.
Figure 2- How Binaural Beats work
According to the example which is describing in this picture, the left head phone will play an audio tone of 500Hz. The right head phone will play a tone of 510Hz. Then the brain will mix the two tones and it will take the difference of 10Hz. Now the brain has a tone that has an Alpha frequency. So the state of the brain will be easily convert in to Alpha. That means you are relaxed.
This is one way of relaxing your mind by using audio tones. This is a basic concept behind the music therapy.
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