Lateral coherence of the electrocorticogram: a new measure of brain synchrony.

Electroencephalography and Clinical Neurophysiology
T H Bullock, M C McClune

Abstract

As one test of the idea that compound field potentials in higher centers have a fine structure, the horizontal extent of coherence (C) was studied on the brain surface, with many closely spaced semimicroelectrodes in rabbits and rats. On the average C tends to fall with distance (D) in the 0.5-10 mm range; apart from driven rhythms, C usually falls to noise level at D greater than 10 mm. A useful measure is D (mm) where C has fallen to 0.5 (DC = 0.5); for most F bands within the range 1-50 Hz this is usually 2.5-5 mm, averaging over the neocortex in both species. Synchrony for neural tissue should mean a degree of congruence in a population (not a 2-point correlation); decline of C with D can measure synchrony by reflecting the volume at or above a specified C. Sleeping and waking mammals, an invertebrate (Aplysia), a ray, and a reptile were compared in degrees of synchrony; this cannot be judged by eye and is found sometimes hardly different between high-voltage-slow and low-voltage-fast states. Aplysia has negligible synchrony; the ray and lizard may be intermediate. C maps show patchiness superimposed on the general decline with D; no obvious pattern between parts of the cortex is consistent among individuals. Factors influe...Continue Reading

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