[Dipole models of alpha-rhythm generators].
Different hypothesis of the alpha rhythm origin were tested by dipole simulation of the alpha rhythm sources. EEG was recorded during driving photic stimulation in order to increase the signal-to-noise ratio. Models with fixed and moving dipoles were analyzed. Dipole sources were compared with magnetic resonance imaging (MRI) scans to find the exact location of oscillations in brain anatomical structures. A two-level multiple dipole model was found to fit the EEG most adequately. The first level was represented by two oscillators localized in the thalamic reticular nuclei, and the second level is associated with two modality-specific oscillators localized in the respective cortical areas.
Isaĭchev
S A
SA
Department of Patophysiology, Lomonosov State University, Moscow.
Osipova
D S
DS
Koptelov
Iu M
IuM
D000328:Adult; D000513:Alpha Rhythm; D001921:Brain / Q000033:anatomy & histology*; D004569:Electroencephalography; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D010507:Periodicity