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beta rhythm

An EEG rhythm in the range of 13-35 Hz, when the predominant frequency, beta rhythm, is usually associated with alert wakefulness or vigilance and is accompanied by a high tonic EMG. The amplitude of beta rhythm is variable but usually is below 30 uV. This rhythm may be drug induced.

Definition reprinted with permission from Culebras, Antonio, Clinical Handbook of Sleep Disorders, Butterworth-Heinemann