process of slow wave propagation in the brain of about 0.1m per second has been shown in vivo. slow wave propagation was also recorded by inserting two electrodes into two ends of a piece of mouse brain taken from a freshly killed mouse. the tissue was then cut between the two electrode positions, severing any possible link by neurons or gap junctions between the two electrodes. the slow wave continued to propagate and could only be stopped by separating the two pieces of tissue with a 400 micron gap. assuming the reproducibility of this experiment skeptics of ephaptic coupling should be satisfied it is a real phenomena and investigations will focus now on its mechanisms and role rather than it's existence.