The brain is an electrochemical organ. Researchers speculate that a fully functioning brain can generate as much as 10 watts of electrical power. So brain waves are an electrical impulse in the brain.
Brain waves occur when neurons send signals between each other. There are several different types of brain waves. But the main ones are Beta, Alpha, Theta, and Delta.
Beta waves are the most rapid pattern. And are associated with concentration, arousal, alertness and cognition.
You experience Alpha waves as you become more relaxed. The brain waves slow into an Alpha wave pattern. Associated with super-learning, flow states and joy.
Still slower brain wave patterns are Theta waves. Often experienced by meditators. When you’re dreaming at night, you’re making Theta waves. Theta waves are associated with creativity, “integrative experiences” and relief from trauma. An “ah-ha moment” is a burst of Theta waves in your brain.
The slowest of all brain wave patterns are Delta Waves. They are generally associated with dreamless sleep. Very advanced meditators are able to remain alert in this deep, trance-like state. Delta waves are associated with leadership, persuasion, achievement and Oneness.