Further evidence on the locus of the visual area in the temporal lobe of the monkey.

Abstract Pattern discrimination retention was tested in 33 monkeys divided into nine operated groups in an attempt to define the limits of the inferotemporal visual area more precisely than before. Six groups had small coronal strip lesions distributed along the length of the inferior temporal convexity, and the other three had much larger removals adjacent to the convexity. Impairment was found only after the small strip lesions made in that part of the inferotemporal cortex which extends from the ascending limb of the inferior occipital sulcus forward for about 2 cm to the posterior tip of the anterior middle temporal sulcus. Correlation with data from neuroanatomical and neuronographic studies suggests that this behaviorally defined visual area may be composed of two neurally distinguishable subareas, TE and TEO of Bonin and Bailey.