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BRAINWAVES
Brain
States and Frequencies
Posted:
Jul 2008
EEG
(electroencephalography)
technology is used to measure
brain's electrical vibrations
from the surface of the scalp.
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
Theta
Alpha
Beta
|
0.5-4Hz
4–8Hz
8–14Hz
14–30Hz |
Deep
sleep
Drowsy (also first stage
of sleep)
Relaxed but alert
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. The purpose of Brainwave
Podcast is 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.
|
