With respect to traditional broad band frequency analysis, generally, all of these frequencies occur during the waking state and are not “good” or “bad” by nature. Rather, their value as “good” or “bad” is determined by the context in which they occur. For example, Theta wave activity is desirable during creative activities such as daydreaming. However, such activity would be undesirable when one is supposed to be focused on a teacher giving a lesson in class.

Delta (1.0-3.5 Hz): These are very slow waves that are usually associated with sleep states. However, such activity has also been reported in mathematical problem-solving and some forms of meditation.

Theta (4.0-7.5 Hz): Also a slow wave, theta is associated with hypnagogic states, creative processes, and daydreaming.

Alpha (8.0-12.0 Hz): Alpha activity is generally associated with calm, restful, and relaxed states. It reflects that your brain is “turned on” but in a neutral state, similar to a car with the engine running but gearshift in neutral.

Beta (12.5-25.0 Hz): Beta activity usually occurs during active thinking, processing and/or problem solving. On the other hand, it may also reflect over thinking, rumination, and worry.

© 2003 John W. DeLuca, Ph.D. All Rights Reserved