
1) Active brain rhythm 2) Sign of mental activity 3) Wakefulness indicator on EEGs
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https://www.crosswordclues.com/clue/beta-wave

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 are 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 ...
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http://en.wikipedia.org/wiki/Beta_wave

Synonym for beta rhythm ... <neurology> Brain waves in the electroencephalogram which have a frequency of 18 to 30 per second. They are typical during periods of intense activity of the nervous system, and occur principally in the parietal and frontal regions. ... (12 Dec 1998) ...
Found on
http://www.encyclo.co.uk/local/20973

Type: Term Synonyms: beta rhythm
Found on
http://www.medilexicon.com/medicaldictionary.php?t=99671

beta rhythm, beta wave 1. A pattern of electrical waves in the brain of someone who is awake and active. 2. In electroencephalography, a rapid rhythm usually of low voltage, which can be recorded in the motor areas of the brain and sometimes in the frontal regions; especially, during states of stress or anxiety or after the administration of certa...
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http://www.wordinfo.info/words/index/info/view_unit/1857/
No exact match found.