Cite as:
Bark L, Shevelev I A, Kamenkovich R, Verkhlutov V M, Konyshev V, Sharaev G A, 1999, "Dynamic localisation of equivalent current dipole (ECD) of alpha rhythm during visual illusions evoked by flicker with alpha frequency and the scanning hypothesis" Perception 28 ECVP Abstract Supplement

Dynamic localisation of equivalent current dipole (ECD) of alpha rhythm during visual illusions evoked by flicker with alpha frequency and the scanning hypothesis

L Bark, I A Shevelev, R Kamenkovich, V M Verkhlutov, V Konyshev, G A Sharaev

For testing the scanning hypothesis (Pitts and McCulloch, 1947 Bulletin of Mathematical Biophysics 9 57 - 76) we studied dynamic localisation of equivalent current dipole of alpha rhythm in twelve healthy subjects with 2 ms step using real head model based on magnetic resonance tomography. Subjects were sitting quietly with their eyes closed. The dipole was localised in the occipital cortex and during the development of a single alpha wave it shifted in one or another direction while the dipole moment underwent fan-like rotation mainly in sagittal and horizontal planes. The results obtained indicate changing localisation of the alpha rhythm source along Fissura calcarina (striate cortex). This supports the view that alpha wave reflects the spreading process confirming the scanning hypothesis which is still under discussion.

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