In order to understand what is the difference between sleeping, drowsiness, meditation, relaxation or active state it is necessary to understand how our brain works.
Your brain, spinal cord and peripheral nerves make up a complex, integrated information-processing and control system known as your central nervous system.
Together they regulate all the conscious and unconscious aspects of your life.
Your brain is made of approximately 100 billion nerve cells, called neurons.
Neurons have the ability to gather and transmit electrochemical signals. They act as the computer.
Neurons share the same characteristics and have the same makeup as other cells, but the electrochemical aspect lets them transmit signals and send messages between each other.
The electrical activity of our brain is measurable. The activity of the brain depends of our own activity. Brain behaves differently when we sleep from the situation when we are learning.
EEG (electroencephalography) technology is used to measure brain’s electrical vibrations from the surface of the scalp.
EEG measures voltage fluctuations resulting from ionic current within the neurons of the brain.
The resulting EEG pattern will contain frequency elements mainly below 30Hz. The frequencies are categorized into four states as follows.
STATE FREQUENCY STATE OF MIND
Delta 0.5-4Hz Deep sleep
Theta 4–8Hz Drowsy (also first stage of sleep)
Alpha 8–14Hz Relaxed but alert
Beta 14–30Hz Highly alert and focused
The dominant frequency in the brain’s EEG pattern determines what shall be called the current state of the brain.
If the amplitude of the alpha range frequencies is highest, then the brain is said to be in the alpha state.
As we see, the sleeping is the activity associated to lowest brainwave frequencies.
The Brainwave Podcast are used to affect the brain’s state to achieve different results.
Brain’s EEG pattern always consists of a wide range of different frequencies.
The most dominant of them determines the current state of mind, but note that this is not any “exact frequency the brain is operating on”. There are always also other frequency components present.