This post contains info on Wave patterns concerning EEG
From my reading here is some stuff which i wish to highlight:
There are five main wave patterns that are distinguished. In increasing frequency they are Delta, Theta, Alpha, Beta and Gamma waves.
Details on each pattern:
-Delta is the frequency range up to 4 Hz. It tends to be the highest in amplitude and the slowest waves.
It is seen normally in adults in slow wave sleep. Mental activity mainly concerns deep sleep.
-Theta is the frequency range from 4 Hz to 7 Hz. Theta is seen normally in young children. It may be seen
in drowsiness or arousal in older children and adults; it can also be seen in meditation. Mental activity mainly concerns unconsious and deep meditation.
-Alpha is the frequency range from 8 Hz to 12 Hz. It emerges with closing of the eyes and with relaxation,
and attenuates with eye opening or mental exertion. Mental activity mainly concerns relaxtion and concentration.
-Beta is the frequency range from 12 Hz to about 30 Hz.Beta activity is closely linked to motor behavior and is generally attenuated during active movements. Low amplitude beta with multiple and varying frequencies, however, is often associated with active, busy or anxious thinking and active concentration. It is the dominant rhythm in patients who are alert or anxious or who have their eyes open. Mental activity mainly concerns thinking, attention and problem solving
-Gamma is the frequency range approximately 30–100 Hz. Gamma rhythms are thought to represent binding of different populations of neurons together into a network for the purpose of carrying out a certain cognitive or motor function. This is the least understood of all the other wave forms. Mental activity mainly concerns movement of finger toes and toungue.
Heres a link to someuseful info: http://web-us.com/brainwavesfunction.htm
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