beta rhythm

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beta rhythm

n.

beta rhythm

or

beta wave

n
(Physiology) physiol the normal electrical activity of the cerebral cortex, occurring at a frequency of 13 to 30 hertz and detectable with an electroencephalograph. See also brain wave

be′ta rhythm`


n.
a pattern of high-frequency brain waves (beta waves) observed in normal persons upon sensory stimulation, esp. with light, or when they are engaging in purposeful mental activity.
[1935–40; translation of German Betawellen; see alpha rhythm]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.beta rhythm - the normal brainwave in the encephalogram of a person who is awake and alertbeta rhythm - the normal brainwave in the encephalogram of a person who is awake and alert; occurs with a frequency between 12 and 30 hertz
brain wave, brainwave, cortical potential - (neurophysiology) rapid fluctuations of voltage between parts of the cerebral cortex that are detectable with an electroencephalograph
References in periodicals archive ?
Specifically, they found that the changes in the size of brain waves, called beta rhythms, correlated with the improvements the volunteers made during the rests.
Abnormalities in mu and beta rhythms have been described in ASD patients while performing motor imitation tasks, such as reduced mu-suppression during movement observation [22-24], although the relatively small sample sizes in these studies (less than 20 people per group) calls for caution in the generalization of those findings and the need for replicative studies.
Beta rhythms are modulated when the subjects are alert and attentive to external stimuli or exert a motor imagery task [28-30].
While shorter time windows have also been used in similar analyses [52], differences in the behavior of alpha and beta rhythms between the window around the imagery onset and later windows have been identified with regard to networks [53], relative power [54], and event-related desynchronization [55].
The mean power and interquartile interval (in [mu][V.sup.2]/Hz) for the delta, theta, alpha and beta rhythms regarding the ECoG's can be seen in Figure 4.
Mu rhythms as well as beta rhythms (1530 Hz) are suppressed prior to a sound action (such as tapping on a drum) and exhibit rebound enhancement immediately after that action, whether the action is performed, observed, or heard [29].
We have addressed this question and also evaluated the potential differences in biological activity between A/[[beta].sub.25-35] and A/[[beta].sub.1-42] on both cholinergically and glutamatergically induced theta rhythms, as was done earlier for beta rhythms [9].