A Study of Origins of the Time Dependencies of Scalp EEG: II-Experimental Support of Theory

Solutions of earlier published "brain wave equations" are modified to roughly account for the effects of boundary conditions. When a threshold parameter A 1, the theoretical waves are nondispersive, spatially damped, and have frequencies that depend on cortical geometry and the action potential velocity in the association fibers. The frequency of these theoretical oscillations is near 10 cycles/s, within a factor of about two, and decreases slowly with increasing A. When pyramidal cell thresholds are altered such that A 1, there is an abrupt decrease in the frequency. The theoretical waves are then dispersive, more wealdy damped, and have much lower frequencies than in the case A 1.