Abstract
The regional cerebral blood flow in response to unilateral photic stimulation of the retina was determined for the principal components of the ipsilateral and contralateral visual pathways in three intact and three “split-brain” monkeys. Three nonstimulated animals served as controls. In the stimulated, intact animals, the visual evoked response and the regional cerebral blood flow were bilaterally symmetrical. In the preparations with surgical section of the optic chiasm and corpus callosum, the ipsilateral visual evoked response was twice the amplitude of the contralateral evoked response, and there was an increase in cerebral blood flow in the lateral geniculate bodies, the optic radiations, and the visual cortices that was significantly greater, at the P = 0.05 level, than the contralateral homologous structures.
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