Answers: Neurofeedback and Brainwaves
Brainwaves
Scientists studying the brain have found that it continuously produces four distinct speeds or frequencies of brain waves. Although these different brain waves are produced simultaneously and in combination, a person's state of consciousness depends on the dominant (strongest) frequency band at each time. During sleep, the brain produces dominant slow delta waves. During daydreaming or in the twilight of sleep, the brain produces dominant theta waves that are slow but a bit faster than delta. When the brain is calm and mentally unfocused -- for example when a person relaxes with the eyes closed -- the still faster alpha waves are dominant. Finally, when people work on mentally demanding tasks concentrate on schoolwork in an alert and focused way, the beta waves that are the fastest of these four classes of brainwaves become dominant.
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