The parallel visual motion inputs into areas V1 and V5 of human cerebral cortex

Summary Published clinical evidence has led us to hypothesize that there are parallel pathways which lead to the striate (VI) and prestriate cortex in the human brain. We have used the technique of visually evoked EEG coupled to magnetoencephalography (MEG) to test our hypothesis, by detecting the timing of arrival of signals into these visual areas, using published PET evidence to guide us in the location of the evoked response sources. We found that, if the moving stimulus has a speed of 22° s−1, signals arrive in V5 before V1: with speeds of