Striate cortex extracts higher-order spatial correlations from visual textures.

K P Purpura; J D Victor; E Katz

doi:10.1073/pnas.91.18.8482

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Striate cortex extracts higher-order spatial correlations from visual textures.

K P Purpura·J D Victor·E Katz

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Abstract

Spatial correlations define the statistical structure of any visual image. Two-point correlations inform the visual system about the spatial frequency content of an image. Higher-order correlations can capture salient features such as object contours. We studied "isodipole" texture discrimination in V1 to determine if higher-order spatial correlations can be extracted by early stages of cortical processing. We made epicortical, local field potential, and single-cell recordings of responses elicited by isodipole texture interchange in anesthetized monkeys. Our studies demonstrate that single neurons in V1 can signal the presence of higher-order spatial correlations in visual textures. This places a computational mechanism, which may be essential for form vision at the earliest stage of cortical processing.

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Animals Evoked Potentials Macaca fascicularis Pattern Recognition, Visual Visual Cortex Visual Perception Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S.

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K P Purpura, J D Victor, E Katz. 1994-08-30. Striate cortex extracts higher-order spatial correlations from visual textures.. https://doi.org/10.1073/pnas.91.18.8482

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