Journal
JOURNAL OF COMPARATIVE NEUROLOGY
Volume 522, Issue 11, Pages 2576-2593Publisher
WILEY
DOI: 10.1002/cne.23550
Keywords
rodents; somatosensory cortex; visual cortex; cortical evolution; comparative neuroanatomy
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Funding
- CAPES/PROCAD [0024/01-5]
- CNPq/PROSET-MCT [350106/2007-0]
- CNPq [306722/2009-7, 476627/2011-7, 474933/2012-1, 311253/2009-1, 483404/2013-6]
- FAPERJ [E-26/111.721/2012]
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We analyzed the organization of the somatosensory and visual cortices of the agouti, a diurnal rodent with a relatively big brain, using a combination of multiunit microelectrode recordings and histological techniques including myelin and cytochrome oxidase staining. We found multiple representations of the sensory periphery in the parietal, temporal, and occipital lobes. While the agouti's primary (V1) and secondary visual areas seemed to lack any obvious modular arrangement, such as blobs or stripes, which are found in some primates and carnivores, the primary somatosensory area (S1) was internally subdivided in discrete regions, isomorphically associated with peripheral structures. Our results confirm and extend previous reports on this species, and provide additional data to understand how variations in lifestyle can influence brain organization in rodents. (C) 2014 Wiley Periodicals, Inc.
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