Figure-Ground Segregation by a Population of V4 Cells
Figure-ground (FG) segregation is a crucial function of the intermediate-level vision. Physiological studies have suggested that monkey V4 cells are sensitive to FG organization, although their selectivity to FG and what they represent have not been clarified. We investigated computationally whether a subpopulation of cells in V4 represents FG. Specifically, we applied support vector machine to the responses of 1–100 cells to natural-image patches that were recorded from V4 of two macaque monkeys (Macaca fuscata) by multi-electrode arrays. Our results showed that the responses of a group of cells were capable of segregating FG while the responses of single-cells were not, suggesting a distributed representation of FG in V4.
KeywordsVisual cortex V4 Figure ground segregation Natural image Electrophysiology Population coding Support vector machine
This work was supported by grant-in-aids from JSPS and MEXT of Japan (KAKENHI 26280047, 25135704 (Shitsukan)), and from RIEC of Tohoku University (H25-A09).
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