alpha rhythm


Also found in: Thesaurus, Medical, Encyclopedia.
Related to alpha rhythm: beta rhythm

alpha rhythm

or

alpha wave

n
(Physiology) physiol the normal bursts of electrical activity from the cerebral cortex of a drowsy or inactive person, occurring at a frequency of 8 to 12 hertz and detectable with an electroencephalograph. See also brain wave

al′pha rhythm`


n.
a pattern of slow brain waves (al′pha waves`) in normal persons at rest with closed eyes, thought by some to be associated with an alert but daydreaming mind.
[1935–40]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.alpha rhythm - the normal brainwave in the electroencephalogram of a person who is awake but relaxed; occurs with a frequency of 8-12 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 ?
based on 10 Hz alpha frequency/phase (alpha rhythm on occipital area or mu rhythm on motor area).
Specifically, the researchers tracked the alpha rhythm in the brain, which occurs at between 8 and 13 Hertz and is a measure of whether the brain is being engaged or is in a resting or "autopilot" mode.
Conventionally, cortical alpha rhythm is associated with low information processing.
For our analysis, DTF was computed for the networks formed at the frequency bands of alpha rhythm at 8-12 Hz ("alpha networks") and beta rhythm at 13-30 Hz ("beta networks"), as those are considered the brainwaves most relevant to the sensorimotor processes [73].
Spontaneous slow fluctuation of EEG alpha rhythm reflects activity in deep-brain structures: A simultaneous EEG-fMRI study.
The results correlate with the explanation of loss of normal alpha rhythm and prominence of delta rhythm during encephalopathy.
The article presents the results of measuring the alpha rhythm of nine volunteers.
It was rhythmic with an 8-9-Hz alpha rhythm, and no abnormalities were found.
This is the target for the detection of alpha waves by EEG, which normally occur in awake humans with closed eyes, and in a case of a distress the activity of the alpha rhythm fades away.
Jennifer then starts to ask questions about her and Marty's future self, but the Doc thought this to be a bad idea and activates a "Sleep-inducing Alpha Rhythm Generator", a hand-held electronic gadget that emitted light which instantaneously put Jennifer to sleep.
The alpha rhythm only differed significantly between the IR90 and the control groups.
for alpha rhythm generation [1] and redesigned by Jansen and Rit to represent the generation of evoked potentials in the visual cortex [2].