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Interhemispheric connections of visual cortex in the owl monkey, Aotus trivirgatus, and the bushbaby, Galago senegalensis

Newsome, William T. and Allman, John M. (1980) Interhemispheric connections of visual cortex in the owl monkey, Aotus trivirgatus, and the bushbaby, Galago senegalensis. Journal of Comparative Neurology, 194 (1). pp. 209-233. ISSN 0021-9967. https://resolver.caltech.edu/CaltechAUTHORS:20200708-152147367

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Abstract

Anatomical techniques have been used to map within visual cortex the pattern of degenerating axonal terminals produced by surgical section of the splenium of the corpus callosum in the owl monkey, Aotus trivirgatus , and the bushbaby, Galago senegalensis . Previous studies in other species have shown that callosal inputs terminate preferentially in regions where the vertical meridian of the visual field is represented. Such a correspondence can serve as a useful aid for locating the boundaries of visual areas. The goals of this study have been (1) to assess the degree of correspondence between callosal inputs and previously identified vertical meridian representations in the owl monkey and bushbaby, and (2) to gain information from the pattern of callosal inputs concerning the existence and organization of as yet unidentified extrastriate visual areas. In both the owl monkey and the bushbaby, a discrete band of degenerating axonal terminals corresponds precisely to the vertical meridian representation at the V1‐V2 border, and a less precise increase in the density of degenerating axonal terminals corresponds to the vertical meridian representation of extrastriate area MT. A well‐defined band of degeneration on the ventral surface of the owl monkey's cerebral hemisphere corresponds to a previously unknown vertical meridian representation which is shared by two newly identified extrastriate visual areas. Elsewhere in visual cortex the pattern of callosal connections is more complex. Although this pattern may still reflect visual topography, it is not immediately useful for distinguishing areal boundaries.


Item Type:Article
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https://doi.org/10.1002/cne.901940111DOIArticle
Additional Information:© 1980 Alan R. Liss, Inc. We thank Jon Kaas for his permission to use unpublished data that he participated in collecting. We are grateful to D.C. Van Essen for use of his histology facilities and A. J. Hudspeth for the use of his microscope. J.F. Baker, A. J. Hudspeth, J. H. R. Maunsell, S. E. Petersen, and D. C. Van Essen made helpful suggestions at various stages in the development of this manuscript. This work was supported by NIH grants NS-12121, NS-00178, and NSF grant BNS-77-15605 to J. M. Allman, a Pew Charitable Trust grant to the Division of Biology, and a Danforth Graduate Fellowship to W. T. Newsome.
Funders:
Funding AgencyGrant Number
NIHNS-12121
NIHNS-00178
NSFBNS-77-15605
Pew Charitable TrustUNSPECIFIED
Danforth FoundationUNSPECIFIED
Issue or Number:1
Record Number:CaltechAUTHORS:20200708-152147367
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200708-152147367
Official Citation:Newsome, W.T. and Allman, J.M. (1980), Interhemispheric connections of visual cortex in the owl monkey, Aotus trivirgatus , and the bushbaby, Galago senegalensis . J. Comp. Neurol., 194: 209-233. doi:10.1002/cne.901940111
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104296
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:09 Jul 2020 14:57
Last Modified:09 Jul 2020 14:57

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