alpha-rhythm

alpha-rhythm

In electroencephalography, rhythmic oscillations in electric potential occurring at an average rate of 10/sec. Synonym: alpha-wave
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In the first module, "cortical functioning," performed assessments on the basis of alpha-wave characteristics, including, nature of alpha rhythm, alpha-rhythm frequency, amplitude, topography, amplitude asymmetry, and changes in alpha waves in response to the provocative tests (see Table 1).
Table 1 EEG features used to determine cortical development of children aged 7-8 with respect to the developmental norm) EEG Feature Developmental level Nature of alpha-rhythm Polyrhythmic D Diminished frequency (6-7 Hz) D Disorganized and/or sharpened + Regular modulated 8-9 Hz + Regular modulated 10-11 Hz - Reaction of basic rhythm to rhythmic photic stimulation No tracking D Rhythm driving at 4-6 Hz but not between 7-12 Hz D Rhythm driving at 7 Hz isolated and/or in addition to 4-6 Hz.
Study of EEG before rehabilitation measures revealed diffusive cerebral changes in the form of reduction of alpha-rhythm, occurrence of dominant low-amplitude, low-frequency beta-activity and prevalence of slow-wave activity (SWA) in the form of disorganized type.