[Interrelationship between differently spaced neurons in the auditory and motor zones of the cerebral cortex in cats]

Multineuronal activity was studied in unrestrained cats with bundles of seven electrodes (tips dia. 50 mcm) chronically implanted in the auditory and motor cortex. Spikes of the highest and lowest amplitude were isolated from each neurogram by an amplitude discriminator. Functional connections between neurones located under different electrodes at a distance of up 540 mcm were defined by statistical dependence of the isolated spike series. In the auditory cortex, the distance at which it was possible to detect connections between high amplitude neurones (H-H) did not exceed 450 mcm, while between low amplitude neurones (L-L) it was 270 mcm. In the motor cortex, dependent relations for similar pairs of neurones (H-H) and (L-L) were found at all the studied distances up to 540 mcm. For mixed neuronal pairs (H-L and L-H) functional connections at different distances were differently expressed at various distances.