American Heritage® Dictionary of the English Language, Fourth Edition
- n. A pattern of smooth, regular electrical oscillations in the human brain that occur when a person is awake and relaxed. As recorded by the electroencephalograph, alpha waves have a frequency of 8 to 13 hertz. Also called alpha rhythm.
- n. neurology An electrical signal produced by the brain while the subject is relaxed.
- n. the normal brainwave in the electroencephalogram of a person who is awake but relaxed; occurs with a frequency of 8-12 hertz
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