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Abstract
Thirteen to 30 days after unilateral visual cortex ablation or after ablation and complete transection of the corpus callosum, high-frequency callosal stimulation inhibited spontaneous and evoked unit activity in most cells sampled in the intact contralateral visual cortex. On the other hand, few units were excited by callosal stimulation. Since orthograde degeneration of callosal fibers should be complete by 11 days after the lesion, these effects are interpreted as resulting from antidromic activation of axon collaterals of callosal-projecting visual-cortex neurons. The antidromic inhibition was found to occlude orthodromic inhibition evoked by lateral geniculate stimulation and was often facilitated by a preceding brainstem reticular stimulation.
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