![]() The only band lower than this is Delta, which is primarily found during deep sleep. Theta bands are on the lower end of the brain wave spectrum, at 4 – 8 Hz. If you have more energy or you’re exerting a great deal of mental effort, you will find higher frequency waves, such as Beta (12 – 30 Hz) or Gamma (30 – 100 Hz). If you are asleep or in a drowsy, relaxed state, these waves will be slower, somewhere in the Delta (0.5 – 4 Hz) or Theta (4 – 8 Hz) bands. ![]() So a 4 Hz signal oscillates 4 times every second. These waves are measured in Hz, representing cycles per second. This is how the regions of the brain communicate and cooperate to get things done. ![]() No matter what you’re doing or thinking, there are brain waves periodically traveling across your cortex. ![]()
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