Visually mediated space localization in monkeys without striate cortex

T. Feinberg, P. Pasik, T. Pasik

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


Three monkeys with bilateral occipital lobectomies and further aspiration of the cortex at the rostral end of the calcarine fissures were trained to reach for a black circle placed at random in one of the 4 quadrants of a white circular disk. Reward for accurate reaching was a cube of apple, 5 mm on a side, stuck on a pin protruding from the center of the target. A correct response required the first contact to be made with the black circle or the apple cube. The initial target subtended approximately 46° of visual angle. After successful performance, the size was decreased progressively to 30°, 18°, 9° and finally it consisted only of the apple cube of about 2°. Testing was always done in a normally illuminated room. All animals reached the criterion of 90% accurate reaches in 200 consecutive trials. When black discs were present, the minimal amount of trials was required. When the monkey had to grasp the apple cube directly, performance dropped to chance but eventually the same criterion was achieved, in a mean of 800 trials and 277 errors. Thus far, only one of the monkeys has been killed and histological examination confirmed the total absence of area 17 and partial damage to areas 18 and 19. Findings indicate that given training, monkeys can localize in space and perform precise tasks requiring eye-hand coordination in the absence of striate cortex.

Original languageEnglish
Pages (from-to)No. 1247
JournalFederation Proceedings
Issue number3
StatePublished - 1977
Externally publishedYes


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