alpha rhythm


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alpha rhythm

[′al·fə ‚rith·əm]
(physiology)
An electric current from the occipital region of the brain cortex having a pulse frequency of 8 to 13 per second; associated with a relaxed state in normal human adults.
References in periodicals archive ?
Moreover, the few between-group differences were observed mostly in alpha rhythm, which could be interpreted as differences only in local processing in the sensorimotor network of SCI patients.
The alpha rhythm index with a planar perception of the FPI image is generally lower than in the case of three-dimensional perception.
The power spectrum of the ECoG showed that for the IR24 group, the ECoG activity regarding theta and alpha rhythms increased relative to the control, and was consistently elevated even at 90 days after IR exposure (group IR90).
Study of human occipital alpha rhythm: the alphon hypothesis and alpha supression, Int.
Comparison of the effect of hard and easy mental arithmetic upon blocking of the occipital alpha rhythm. Quarterly Journal of Experimental Psychology, 8, 142-152.
Mental arithmetic and blocking of the occipital alpha rhythm. Electroencephalography and Clinical Neurophysiology, 16, 595-603.
Finally, Jose Maria Feola (Argentina, but a long-time resident of the USA) reported some interesting but nonsignificant results on the relationship between ESP and the brain's alpha rhythm.
Golla, Hutton & Walter (1943) and Short (1953) suggested that visual imagery was indicated by the suppression of occipital EEG alpha rhythm. Costello & McGregor (1957) concluded that the amount of suppression of the alpha rhythm was a result of firstly, the vividness of the image, and secondly, the extent to which higher order thought processes were involved.
Electroencephalograms on January 15 and 18 demonstrated diffuse slowing and alpha rhythm consistent with encephalopathy.
Short- and Long-Term Effects on Resting-State Alpha Rhythm. In addition to within-session NFB changes during the training runs, we investigated the short-term effect of resting-state alpha-amplitude as recorded immediately before and after NFB [7, 43].
(ii) Visualization of a brain rhythm (Alpha rhythm) associated to the suppression of visual input when the subject closes his eyes or relaxes.