beta-rhythm

beta rhythm

noun
a pattern of high-frequency brain waves (beta waves) observed in normal persons upon sensory stimulation, especially with light, or when they are engaging in purposeful mental activity.

Origin:
1935–40; earlier beta waves, translation of German Betawellen; see alpha rhythm

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World English Dictionary
beta rhythm or beta wave
 
n
physiol See also brain wave the normal electrical activity of the cerebral cortex, occurring at a frequency of 13 to 30 hertz and detectable with an electroencephalograph
 
beta wave or beta wave
 
n

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American Heritage
Medical Dictionary

beta rhythm n.
The second most common waveform occurring in electroencephalograms of the adult brain, characteristically having a frequency from 13 to 30 hertz. It is associated with an alert waking state but can also occur as a sign of anxiety or apprehension. Also called beta wave.

The American Heritage® Stedman's Medical Dictionary
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