The EEG ( electroencephalograph ) measures brainwaves of different frequencies within the brain. Electrodes are placed on specific sites on the scalp to detect and record the electrical impulses within the brain.

A frequency is the number of times a wave repeats itself within a second. It can be compared to the frequencies that you tune into on your radio. If any of these frequencies are deficient, excessive, or difficult to access, our mental performance can suffer.

Amplitude represents the power of electrical impulses generated by brain.
Volume or intensity of brain wave activity is measured in micro volts.
The raw EEG has usually been described in terms of frequency bands.

Brain Wave Frequencies

• Gamma greater than 30(Hz)
• BETA (13-30Hz)
• ALPHA (8-12 Hz)
• THETA (4-8 Hz)
• DELTA (less than 4 Hz)

Delta (0.1 to 3 Hz)  

The lowest frequencies are delta. These are less than 4 Hz and occur in deep sleep and in some abnormal processes also during experiences of "empathy state". Delta waves are involved with our ability to integrate and let go. It reflects unconscious mind.

It is the dominant rhythm in infants up to one year of age and it is present in stages 3 and 4 of sleep.

It tends to be the highest in amplitude and the slowest waves. We increase Delta waves in order to decrease our awareness of the physical world. We also access information in our unconscious mind through Delta.

Peak performers decrease Delta waves when high focus and peak performance are required.

However, most individuals diagnosed with Attention Deficit Disorder, naturally increase rather than decrease Delta activity when trying to focus. The inappropriate Delta response often severely restricts the ability to focus and maintain attention. It is as if the brain is locked into a perpetual drowsy state.

Another way to look at Delta is to imagine you are driving in a car and you shift into 1st gear ....you're not going to get anywhere very fast. So Delta would represent 1st gear.

Delta (0.1-3 Hz):

• Distribution: generally broad or diffused may be bilateral, widespread.
• Subjective feeling states: deep, dreamless sleep, non-REM sleep, trance, unconscious.
• Associated tasks & behaviors: lethargic, not moving, not attentive.
• Physiological correlates: not moving, low-level of arousal.
• Effects of training: can induce drowsiness, trance, deeply relaxed states.

Theta (4-8 Hz)

The next brainwave is theta. Theta activity has a frequency of 3.5 to 7.5 Hz and is classed as "slow" activity. It is seen in connection with creativity, intuition, daydreaming, and fantasizing and is a repository for memories, emotions, sensations. Theta waves are strong during internal focus, meditation, prayer, and spiritual awareness. It reflects the state between wakefulness and sleep. Relates to subconscious.

It is abnormal in awake adults but is perfectly normal in children up to 13 years old. It is also normal during sleep. Theta is believed to reflect activity from the limbic system and hippocampus regions. Theta is observed in anxiety, behavioral activation and behavioral inhibition.

When the theta rhythm appears to function normally it mediates and/or promotes adaptive, complex behaviors such as learning and memory. Under unusual emotional circumstances, such as stress or disease states, there may be an imbalance of three major transmitter systems, which results in aberrant behavior.

Back to our car example, Theta would be considered 2nd gear. Not as slow as 1st gear (Delta) but still not very fast.

• Distribution: usually regional, may involve many lobes, can be lateralized or diffuse.
• Subjective feeling states: intuitive, creative, recall, fantasy, imagery, creative, dreamlike, switching thoughts, drowsy; "oneness", "knowing".
• Associated tasks & behaviors: creative, intuitive but may also be distracted, unfocused.
• Physiological correlates: healing, integration of mind/body.
• Effects of Training: if enhanced, can induce drifting, trance-like state. If suppressed, can improve concentration, ability to focus attention

Alpha (8-12 Hz)

Alpha waves are those between 7.5 and 13(Hz). Alpha waves will peak around 10Hz. Good healthy alpha production promotes mental resourcefulness, aids in the ability to mentally coordinate, enhances overall sense of relaxation and fatigue. In this state you can move quickly and efficiently to accomplish whatever task is at hand. When Alpha predominates most people feel at ease and calm. Alpha appears to bridge the conscious to the subconscious.

It is the major rhythm seen in normal relaxed adults - it is present during most of life especially beyond the thirteenth year when it dominates the resting tracing.

Alpha rhythms are reported to be derived from the white matter of the brain. The white matter can be considered the part of the brain that connects all parts with each other.

Alpha is a common state for the brain and occurs whenever a person is alert (it is a marker for alertness and sleep), but not actively processing information. They are strongest over the occipital (back of the head) cortex and also over frontal cortex.

Alpha has been linked to extroversion (introverts show less), creativity (creative subjects show alpha when listening and coming to a solution for creative problems), and mental work.

When your alpha is with in normal ranges we tend to also experience good moods, see the world truthfully, and have a sense of calmness. Alpha is one of the brain's most important frequency to learn and use information taught in the classroom and on the job.

You can increase alpha by closing your eyes or deep breathing or decrease alpha by thinking or calculating.

Alpha-Theta training can create an increase in sensation, abstract thinking and self-control.

In our car scenario, Alpha would represent neutral or idle. Alpha allows us to shift easily from one task to another.

• Distribution: regional, usually involves entire lobe; strong occipital w/eyes closed.
• Subjective feeling states: relaxed, not agitated, but not drowsy; tranquil, conscious.
• Associated tasks & behaviors: meditation, no action.
• Physiological correlates: relaxed, healing.
• Effects of Training: can produce relaxation.
• Sub band low alpha: 8-10: inner-awareness of self, mind/body integration, balance.
• Sub band high alpha: 10-12: centering, healing, mind/body connection.

Beta (above 12 Hz)

Beta activity is 'fast' activity. It has a frequency of 14 and greater Hz. It reflects desynchronized active brain tissue. It is usually seen on both sides in symmetrical distribution and is most evident frontally. It may be absent or reduced in areas of cortical damage.

It is generally regarded as a normal rhythm and is the dominant rhythm in those who are alert or anxious or who have their eyes open.

It is the state that most of brain is in when we have our eyes open and are listening and thinking during analytical problem solving, judgment, decision making, processing information about the world around us.

Beta would represent overdrive or hyper drive in our car scenario.

The beta band has a relatively large range, and has been divided into low, midrange and high.

Low Beta (12-15 Hz), formerly "SMR":

• Distribution: localized by side and by lobe (frontal, occipital, etc).
• Subjective feeling states: relaxed yet focused, integrated.
• Associated tasks & behaviors: low SMR can reflect "ADD", lack of focused attention.
• Physiological correlates: is inhibited by motion; restraining body may increase SMR.
• Effects of Training: increasing SMR can produce relaxed focus, improved attentive abilities.

Midrange Beta (15-18 Hz):

• Distribution: localized, over various areas. May be focused on one electrode.
• Subjective feeling states: thinking, aware of self & surroundings.
• Associated tasks & behaviors: mental activity.
• Physiological correlates: alert, active, but not agitated.
• Effects of Training: can increase mental ability, focus, alertness, IQ.
  
  High Beta (above 18 Hz):
• Distribution: localized, may be very focused.
• Subjective feeling states: alertness, agitation.
• Associated tasks & behaviors: mental activity, e.g. math, planning, etc.
• Physiological correlates: general activation of mind & body functions.
• Effects of Training: can induce alertness, but may also produce agitation, etc.

Gamma (above 36 Hz)

Gamma is measured between 36 ­ 44 (Hz) and is the only frequency group found in every part of the brain. When the brain needs to simultaneously process information from different areas, its hypothesized that the 40Hz activity consolidates the required areas for simultaneous processing. A good memory is associated with well-regulated and efficient 40Hz activity, whereas a 40Hz deficiency creates learning disabilities.

Gamma (40 Hz):

Distribution: very localized
Subjective feeling states: thinking; integrated thoughts
Associated tasks & behaviors: high-level information processing, "binding"
Physiological correlates: associated with information-rich task processing
Effects of Training: not known.