how phase difference changes with distance. If greater than zero then the phase lock measures cannot be explained by volume conduction. Further, because connection density decreases as a function of distance and conduction delays linearly accumulate with distance then if there is an increase in phase differences as a function of distance than this also cannot be explained by volume conduction. If absolute phase differences are significantly greater than zero and increase as a function of distance than this is consistent with physiological connections between connected parts of a network in which conduction velocity, synaptic rise times and synaptic delays produce accumulative time delays.
