The Representation of Orientation in Macaque V2: Four Stripes Not Three
| Autor: | Arun Parajuli, Anastasia Eriksson, Daniel J. Felleman, Heejin Lim, Youping Xiao, Yi Wang |
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| Rok vydání: | 2014 |
| Předmět: |
Male
Support Vector Machine Cognitive Neuroscience Geometry Orientation (graph theory) Cortical imaging Macaque Electron Transport Complex IV Cellular and Molecular Neuroscience biology.animal Orientation medicine Animals Visual Pathways Clockwise Visual Cortex Communication Brain Mapping Luminescent Agents biology business.industry Articles Dominance Ocular Macaca fascicularis Visual cortex medicine.anatomical_structure Receptive field Luminescent Measurements Female business Photic Stimulation |
| Zdroj: | Cerebral cortex (New York, N.Y. : 1991). 25(9) |
| ISSN: | 1460-2199 |
| Popis: | Area V2 of macaque monkeys is traditionally thought to consist of 3 distinct functional compartments with characteristic cortical connections and functional properties. Orientation selectivity is one property that has frequently been used to distinguish V2 stripes, however, this receptive field property has been found in a high percentage of neurons across V2 compartments. Using quantitative intrinsic cortical imaging, we derived maps of preferred orientation, orientation selectivity, and orientation gradient in thin stripes, thick stripes, and interstripes in area V2. Orientation-selective responses were found in each V2 stripe, but the magnitude and organization of orientation selectivity differed significantly from stripe to stripe. Remarkably, the 2 pale stripes flanking each cytochrome oxidase dense stripe differed significantly in their representation of orientation resulting in their distinction as type-I and type-II interstripes. V2 orientation maps are characterized by clockwise and anticlockwise "orientation pinwheels", but unlike V1, they are not homogeneously distributed across V2. Furthermore, V2 stripes contain large-scale sequences of preferred orientation. These analyses demonstrate that V2 consists of 4 distinct functional compartments; thick stripes and type-II interstripes, which are strongly orientation selective and thin stripes and type-I interstripes, which are significantly less selective for orientation and exhibit larger orientation gradient magnitudes. |
| Databáze: | OpenAIRE |
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