Emergence of un-correlated common-mode oscillations in the sensory cortex

摘要

Simulatneous EEG recordings from various cortical areas indicate the presence of common- mode, spatially coherent oscillations. These oscillations are characterized by a common wave form with a spatially distributed pattern of amplitude modulation (AM). We observe highly reproducible AM patterns across spatially separated channels within various areas, yet the temporal correlations between the channels are low. In the framework of the present research, a nonlinear, spatially distributed dynamical model of neuronal populations (KIII). Is used for the interpretation of the observed spatial coherence. The theoretical findings are in good agreement with experiments performed with chronically implanted rabbits.