The brain produces gamma, beta, alpha, theta, and delta waves. Their frequency and wavelength differ.


Gamma waves range from 31 to 120 Hz. We are in this state when we have bright ideas or when our brain is hyper active.


Beta waves range from 13 to 30 Hz. This is when we are awake, alert, or mentally engaged. We spend a lot of time here when we are at work, in conversation, or doing day-to-day activities.


Alpha waves range from 8 to 12 Hz. We produce these waves when we are relaxing. We could be relaxing on a couch or meditating. It is when we mentally relax and disengage ourselves from tasks.


Theta waves range from 4 to 7 Hz. These occur when we are deeply relaxed. For instance, as we drift off to sleep or in the morning as we are slowly waking up from a deep sleep.


Delta waves range from 0.5 to 3 Hz. These waves occur when we are in dreamless sleep.