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NEUROLOGY 1986;36:1513
© 1986 American Academy of Neurology

Proportional anterior commissure area in humans and monkeys

Brett T. Foxman, Jeffrey Oppenheim, Carol K. Petito and Michael S. Gazzaniga

Departments of Neurology (Drs. Foxman, Oppenheim, and Gazzaniga) and Pathology (Drs. Foxman, Oppenheim, and Petito), New York Hospital-Cornell Medical Center, New York, NY.

Behavioral testing following division of the corpus callosum has shown that the anterior commissure can transfer information related to visual tasks interhemispherically in nonhuman primates but not in humans. We have found that the ratio of anterior commissure cross-sectional area to total neocortical commissural area is significantly greater for rhesus monkeys than for humans. This difference persists when the proportions are weighted for these structures' known differences in axon density. We hypothesize that this interspecies dissimilarity reflects a difference in the distribution of interhemispheric communication and may explain the behavioral differences observed after callosal section.

Address correspondence and reprint requests to Dr. Foxman, Department of Neurology, New York Hospital-Cornell Medical Center, 525 East 68th Street, New York, NY 10021.

Aided by USPHS grants 2PO1 NS17778 and 1R01 NS22626.

Accepted for publication March 12, 1986.




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M. Gazzaniga
Organization of the human brain
Science, September 1, 1989; 245(4921): 947 - 952.
[Abstract] [PDF]


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