2.Time-Frequency Analysis

There are lots of different frequencies that can be detected at any moment in time but there is always a predominant frequency.

 All brainwave's are measured in what is known as Hertz (Hz) if you were to take a brainwave frequency of say 15 cycles per second then it would be measured as 15 Hz. It has been proven by Scientists that there is a link between different brainwave frequencies and the different states of mind.

It is the dominant brainwave frequency that determines our state of mind at any given moment in time. To give you an example of this, if you were in a beta state of alertness, you would also be able to detect some alpha frequencies but the dominant frequencies would still be in the beta range. The Entrainment Effect

Brainwave Entrainment is a way in which one sound taken from whatever source will influence another to create what is known as a synchronized frequency. If you were to play the note G on a guitar it would make the G string resonate at the same frequency. In a similar way, the brainwave entrainment phenomena can be used to synchronize your brain to specific frequencies.

Beta waves are in the range of 14 to 30 Hz and are the fastest brainwave's; they are found during our waking state and are associated with our outward awareness the time when we are engaged in what we are doing. This is when we are using our mind for the perception and the evaluation of data through the senses.

Alpha waves are in the range of 8 to 14 Hz and are associated with relaxed but tranquil state of consciousness and the less engaging state of mind, a pleasant inward awareness of the body and mind integration. Alpha waves are dominant during meditation and states of relaxation and are considered the gateway to spirituality.

Theta waves are in the range of 4 to 8 Hz and are associated with creativity, imagery and visualization. Theta waves are present during dreaming and REM states.

Delta waves are in the range of 0.5 to 4 Hz and are associated with deep dreamless sleep and are also present during REM sleep. The deep trance state of delta causes pituitary release of growth hormone and also self healing.

When you talk about brain entrainment most people will know or heard about Binaural beats. This is when two tones at slightly different pitches are played separately into each ear, the brain will then try to even the two pitches out and by doing so creates a third tone which is the difference of the two. This is when synchronization of the hemispheres in the brain occurs.

Monaural beats are sound pulses with exactly matched frequency in both ears and unlike Binaural beats do not require the use of headphones to be affective.

Isochronic tones are more like pulses and also do not require headphones. Isochronic tones are arguably the most powerful out of the three mentioned and have the stronger influence when it comes to brainwave entrainment.