In 1839 German scientist Heinrich Wilhelm Dove discovered that by listening of two tones of different frequencies, each on one ear, one actually, besides the two tones, hears a third one, completely different tone called binocular beat. In 1973 Dr. Gerald Oster showed in his work, published in “Scientific Amarican”, that this stimulation brings to synchronization of brainwaves, namely on a frequency that is equal to subtraction of frequencies that one is stimulated with. For example, if one is stimulated with 410Hz tone on left ear and 400Hz tone on right ear, after few minute dominant brainwave frequency will be 10Hz.

10Hz brain stimulation

Reason for third frequency showing is a fact that human brain detects phase difference between signals to assume where source of sound is (for example, people that are deft on one ear can’t assume position of sound source). When one is stimulated with different frequencies on each ear, brain notices difference between frequencies as phase difference. By setting artificial phase difference we are able to change brain dominant frequencies.

This discovery was followed by research about possible applications of brainwave stimulation in treatment of diseases like epilepsy and asthma, disorders like depression and insomnia, but especially possible use of brainwave stimulation in achieving different state of consequence. There are already lot brainwave stimulator devices on a market. They are helping in achieving brainwave frequencies that are characteristic for certain state of consequence:

1. Relaxation – from 5 Hz to 10 Hz for different relaxation levels.
2. Meditation – from 4 Hz to 7 Hz, as a cycles of certain frequencies
3. Inducted dream – in beginning from 4 Hz and 6 Hz, a then slowing to lower frequencies less then 3.5 Hz.
4. Creative visualization – in beginning 6 Hz, and then 10 Hz.
5. Stress reduction – any frequency below 11 Hz
6. Self-hypnosis – from 8 Hz to 10 Hz with proper hypnotic suggestions
7. Improve learning – from 7 Hz to 9 Hz
8. Improve intuition – from 4 Hz to 7 Hz

In article about self-hypnosis it is denoted how dominant brainwave frequency and state of consequence are connected. Increasing of mental activity (for example, solving of some mathematical problem) means increasing of brainwave dominant frequency. By brainwave stimulation it is possible to achieve wished mental state as shown in upper table.

I developed application for acoustic brain wave stimulation which is able to generate up to 5 pairs of frequencies what is an improvement of current brainwave stimulators because with this application it is possible to get more dominant brain frequencies and it is possible to set any frequencies you want (most brain stimulation programs just has an option to select a mental state you want to achieve, you can’t experiment with entering some frequencies on your own)

Sound brainwave stimulation application

Soon I will upgrade the application so it will be able to play phase shifted signals.
The purpose of this application is, first of all, experimenting with brainwave stimulation, in combination with EEG it can be extremely powerful tool because you have feedback information by watching EEG spectrum – you can actually see how brainwave stimulation affects your brain.

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