Wiktionary
n. (context neurology English) An electrical signal produced by the brain while the subject mentally active.
WordNet
n. the normal brainwave in the encephalogram of a person who is awake and alert; occurs with a frequency between 12 and 30 hertz [syn: beta rhythm]
Wikipedia
Beta wave, or beta rhythm, is the term used to designate the frequency range of human brain activity between 12.5 and 30 Hz (12.5 to 30 transitions or cycles per second). Beta waves can be split into three sections: Low Beta Waves (12.5–16 Hz, "Beta 1 power"); Beta Waves (16.5–20 Hz, "Beta 2 power"); and High Beta Waves (20.5–28 Hz, "Beta 3 power"). Beta states are the states associated with normal waking consciousness.
Usage examples of "beta wave".
This treatment, the first of many, was supposed to start retraining his brain to reduce beta wave production, bringing his rhythms in line with the normal range.