Brain frequencies can be measured with sensors placed on the scalp - then displayed as
brain waves, graphs, or data.
Brain frequencies can be displayed as they are generated by the brain, in real time - and can also
be recorded for further analysis.
Brain frequencies are waves that vary in amplitude (height) and frequency (how often they occur). The number of
waves per second is refered to as hertz or Hz.
Brain frequencies can reveal a surprising amount of information as to the physical and mental state of the
person being measured. A range of brain frequencies are generated in each of the brain hemispheres.
Commonly recognized ranges of brain frequencies
Beta brain frequencies
These waves are 14 Hz to 30 Hz (and higher according to some) - they are the dominant brain frequencies when our
eyes are open, when we are listening, thinking, analyzing, problem solving, judgeing, making decisions, and
processing information about the world around us.
Alpha brain frequencies
These waves are 8 to 13.9 Hz and are the dominant brain frequencies when we are relaxed. Healthy alpha
production promotes mental resourcefulness, assists in the ability to mentally coordinate, enhances overall sense
of relaxation. Most people feel at ease and calm. Alpha is the bridge between the conscious and the
Theta brain frequencies
These waves are 4 to 7.9 Hz and are connected with creativity, intuition, daydreaming, and fantasizing, storing
memories, emotions, and sensations. Theta waves are strong during internal focus, meditation, prayer, and spiritual
Delta brain frequencies
These waves are 0.1 to 3.9 Hz and occur in deep sleep, in some abnormal processes, and during experiences of
empathy. Delta waves are tied to our ability to integrate and let go.
Other brain frequencies
There are several lessor acknowledged ranges of brain frequencies that occur above 30 Hz named gamma,
hypergamma, lambda, and epsilon.
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