![]() It is impossible to put precise boundaries between them: though at 9 Hz, you are likely to be in an alpha state, it is possible you are still in theta. Second, these bands are actually overlapping. First, the brain does not operate on one frequency range at any given time. The descriptions made above are simplified views of what happens in reality. They show up in the higher cortex, during working memory and learning. ![]() Gamma waves are the fastest, with frequencies above 30Hz.They are associated with active thinking and concentration. Beta waves are even higher in frequency range, between 12 - 30 Hz.They are associated with the awake but relaxed state: think being at rest, with your eyes closed, but not tired or asleep. ![]() These are the waves discovered by Berger, and are sometimes named after him (Berger's waves).
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