Our brain is made of billions of brain cells called neurons, and they communicate with each other by electrical changes. The combination of electrical activity of the brain is commonly called a Brainwave pattern[1]. We can actually see these electrical changes as shown in an EEG (electroencephalogram). Brain waves are measured in cycles per second (Hertz or Hz in short form), the lower the number of Hz, the slower the brain activity or the slower the frequency of the activity.

A healthy person finds that the brain shifts numerous times all through the day between different brain wave patterns. Researchers identified typically 4 types of brain waves; they are alpha brain waves, delta brain waves, beta brain waves and theta brain waves. These waves are active most of the time in the brain. On the other hand, one is usually more dominant than other brain waves.

Alpha Brain Waves

Alpha waves (7-13 hz): Alpha is ‘the power of now’, a state when you are relaxed, calm or in a meditative condition. This is a state when you are day dreaming or when you are sleeping quietly. This is also the state when your mind pictures out the thing you want to obtain in life. This is a state where endorphins and serotonin are released from the brain. These are happy hormones that are important to keep the mind relaxed and calm. Alpha waves initiate mind and body integration and learning.

Beta Brain Waves
Beta waves (13-60 hz): occur when we are alert, attentive, actively thinking, decision making and problem solving. Beta brainwaves dominate our normal waking state of consciousness. There are two types of beta brain waves, low and high brain waves. Low Beta brain waves are important as it will help you enhance your concentration, focus and alertness. In this state, the brain releases dopamine hormone. High beta brain waves are a state where you experience panic attack, nervousness, anxiety and stress. This is where the brain releases adrenaline. Too much amount of high beta brain waves is not good for your health.
Theta Brain Waves
Theta waves (4-7 hz): Theta brainwaves occur most often in reduced consciousness, sleep, deep relaxation, such as hypnotic relaxation and meditation, and visualization. It brings us to vivid imagery, intuition and information beyond our normal conscious awareness. Theta brain waves are applicable on enhancing one’s creativity as it helps to release endorphins, serotonin and human growth hormones.
Delta Brain Waves
Delta waves (below 4 hz): Delta brainwaves are the slowest brainwaves. They are generated in unconsciousness, deepest meditation or deep sleep. At this point, the brain is releasing human growth hormones and other hormones. Healing and regeneration are stimulated in this state.
  1. http://www.doctorhugo.org/brainwaves/brainwaves.html