Brain, Vol. 118, No. 6, 1375-1394, 1995
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The parallel visual motion inputs into areas V1 and V5 of human cerebral cortex
1Department of Anatomy, University College London 2Blackett Laboratory, Physics Department, Imperial College London, UK
Correspondence to:
Correspondence to: Dr D. H. ffytche and Professor S. Zeki, Department of Anatomy and Developmental Biology, University College London, Gower Street, London WCIE 6BT, UK
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 <6° s–1, signals arrive in V1 first. We conclude that, in addition to the classical picture of a sequential input to prestriate cortex through V1, there is also a fast parallel input which by-passes V1. The parallelism manifests itself only as a function of the characteristics of the visual stimulus, a phenomenon we describe as dynamic parallelism. The results obtained help us explain the residual motion vision of patients with lesions in V1 or V5.
EEG; magnetoencephalogram; motion evoked response; V1; V5; parallel input; dynamic parallelism
Received January 26, 1995. Revised April 4, 1995. Accepted September 18, 1995.
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