Some subcortical connections of the inferotemporal gyrus of monkey.

Responses evoked by stimulating points along the inferotemporal j.,ryrus of the macaque are found in the anterior commissure, amygdala, medial temporal cortex, the head and basal posterior portions of the putamen, the tail of the caudate nucleus, the pretectaI tegmentum, just lateral to the central gray matter, and the superior colliculus. Tht; superior colliculus projections come from the posterior part of the inferior gyrus only, and the amygdala receives fibers only from the anterior region. Interhemispheric connections of this gyrus go via the anterior commissure, with indications of a shift to corpus callosum crossing as inferotemporal cortex (area TE) blends into prestriate cortex (areas OA and OBO posteriorly). The importance of the various input and ouput connections to the inferotemporal area are considered with regard to visual discrimination performance, and the difference in projections of the anterior and posterior areas is related to findings of a functional difference between these regions.