American Heritage® Dictionary of the English Language, Fourth Edition
- n. The second most common waveform occurring in electroencephalograms of the adult brain, characteristically having a frequency from 13 to 30 cycles per second. It is associated with an alert waking state but can also occur as a sign of anxiety or apprehension. Also called beta rhythm.
- n. neurology An electrical signal produced by the brain while the subject mentally active.
- n. the normal brainwave in the encephalogram of a person who is awake and alert; occurs with a frequency between 12 and 30 hertz
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