Contour Integration Across Gaps: From Local Contrast To Grouping

Vision Research 7 (37):913-924 (1997)
Download Edit this record How to cite View on PhilPapers
This article introduces an experimental paradigm to selectively probe the multiple levels of visual processing that influence the formation of object contours, perceptual boundaries, and illusory contours. The experiments test the assumption that, to integrate contour information across space and contrast sign, a spatially short-range filtering process that is sensitive to contrast polarity inputs to a spatially long-range grouping process that pools signals from opposite contrast polarities. The stimuli consisted of thin subthreshold lines, flashed upon gaps between collinear inducers which potentially enable the formation of illusory contours. The subthreshold lines were composed of one or more segments with opposite contrast polarities. The polarity nearest to the inducers was varied to differentially excite the short-range filtering process. The experimental results are consistent with neurophysiological evidence for cortical mechanisms of contour processing and with the Boundary Contour System model, which identifies the short-range filtering process with cortical simple cells, and the long-range grouping process with cortical bipole cells.
PhilPapers/Archive ID
Upload history
First archival date: 2022-02-03
Latest version: 3 (2022-02-18)
View other versions
Added to PP index

Total views
11 ( #70,865 of 69,984 )

Recent downloads (6 months)
11 ( #55,272 of 69,984 )

How can I increase my downloads?

Downloads since first upload
This graph includes both downloads from PhilArchive and clicks on external links on PhilPapers.