Study of human occipital alpha rhythm: The alphon hypothesis and alpha suppression

Author(s): Kaufman, L., Lu, Z. L., Wang, J. Z., Karron, D.

Journal/Book: Int J Psychophysiol. 1997; 26: PO Box 211, 1000 AE Amsterdam, Netherlands. Elsevier Science BV. 63-76.

Abstract: Alpha rhythm of the parieto-occipital area is comprised of a parade of short-lived cortical excitations (alphons), each of which exhibits oscillations having a stable period within the alpha bandwidth. Strong alpha rhythm is produced by alphons extending over a larger cortical area, although an enhanced cortical current density may also contribute. Local suppression of alpha rhythm indicates when specific cortical areas become engaged in sensory or cognitive functions. Examples are provided for mental imagery, visual memory, auditory memory, and silent rhythming.

Note: Article Williamson SJ, NYU, Dept Phys, Neuromagnetism Lab, Dept Phys, 4 Washington Pl, New York,NY 10003 USA

Keyword(s): alpha rhythm; occipital; human; alphon hypothesis; alpha suppression; PIG THALAMIC NEURONS; BRAIN; MECHANISMS; INVITRO; TASK; EEG

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