When a person closes his or her eyes and relaxes, the brain waves characteristically show a regular pattern of 8 to 12 hertz. These waves are known as:

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The regular pattern of brain waves that occur when a person closes their eyes and relaxes is known as alpha waves, which have a frequency of 8 to 12 hertz. Spindles occur during stage 2 of sleep and have a frequency of 12 to 14 hertz, gamma waves have a frequency of 30 to 100 hertz and are associated with cognitive processing, and delta waves have a frequency of 0.5 to 4 hertz and occur during deep sleep.

When a Person Closes His or Her Eyes and Relaxes