Delayed-response performance following optic tract section, unilateral frontal lesion, and commissurotomy

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Serial operations were performed on 9 Macaca mulatta to transect optic tract on one side, to ablate one frontal area, and to transect the corpus callosum, psalterium and anterior commissure. Relayed-response performance in Ss with visual input ipsilateral to normal frontal area was superior to that in those with visual input contralateral to normal cortex. Subsequent commissurotomy virtually ended correct delayed-response performance in Ss with contralateral lesions, but had far less effect on those with ipsilateral lesions. Hyperactivity was not correlated with impairment of delayed-response performance. Corticocortical connections between occipital and anterior frontal cortex via cortical association fibers are probably crucial for successful delayed-response performance. Moreover, interhemispheric connections are capable of sustaining psychological functions dependent on corticocortical connections. (18 ref.) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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