Effects of surface cues on macaque inferior temporal cortical responses
| Autor: | György Benedek, Károly Köteles, Zoltán Chadaide, Gyula Kovács, Rufin Vogels, Gyula Sáry, Tamás Tompa |
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| Rok vydání: | 2003 |
| Předmět: |
genetic structures
Color vision Cognitive Neuroscience media_common.quotation_subject Macaque Luminance Contrast Sensitivity Cellular and Molecular Neuroscience Form perception Perception biology.animal Psychophysics Animals Lighting media_common Temporal cortex Neurons Communication biology business.industry Darkness Macaca mulatta Temporal Lobe Electrophysiology Form Perception Pattern Recognition Visual Practice Psychological Macaca nemestrina business Psychology Neuroscience Color Perception Photic Stimulation |
| Zdroj: | Cerebral cortex (New York, N.Y. : 1991). 13(2) |
| ISSN: | 1047-3211 |
| Popis: | Humans are able to recognize objects when surface details, such as colour, texture and luminance gradients, are not available. By systematically eliminating colour, texture, shading, contrast and inner contours from given objects, we tested whether certain shape-selective inferior temporal cortex (IT) neurons of awake rhesus monkeys remain selective for these objects as the surface information is reduced. In psychophysical experiments, we established that the rhesus monkey can identify the shape of a coloured object largely independently of its surface characteristics and, to a lesser degree, of its inner contours. Shape selectivity of the neurons does not change when texture and shading are concealed. The responsiveness of the neurons is also affected by the removal of these surface attributes. The IT neurons were found to respond highly similarly to objects brighter or darker than their background. Selectivity for shape is preserved when the contrast is reversed. Deletion of the inner contours, outlining the main parts of the objects, did not affect the responses and selectivity of the IT neurons. These findings indicate that the IT can contribute to the invariant perception of objects having different surface details. |
| Databáze: | OpenAIRE |
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