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| + | ====== Uniform versus random orientation in fading and filling-in ====== | ||
| + | ==== C. H. Attar, K. Hamburger, R. Rosenholtz, H. Gotzl, & L. Spillman ==== | ||
| + | ---- | ||
| + | |||
| + | ===== Abstract ===== | ||
| + | |||
| + | V1 responses to an optimally oriented test line in the receptive field center may be modulated by placing lines of same or different | ||
| + | orientations in the surround. While iso-orientation produces strong inhibition, cross-orientation enhances the response [Knierim, J. | ||
| + | J., & Van Essen, D. C. (1992). Neuronal responses to static texture patterns in area V1 of the alert macaque monkey. Journal of Neurophysiology, | ||
| + | 67, 961–980]. We looked for a perceptual correlate of neuronal texture modulation using perceived salience as well as fading | ||
| + | and filling-in as response criteria. Two patterns by Vicario (1998) [Vicario, G. B. (1998). On Wertheimer’s principles of organization. In | ||
| + | G. Stemberger, (Ed.), Gestalt theory, (Vol. 20, pp. 256–270). Vienna: Verlag Krammer] served as targets. One consisted of randomly oriented | ||
| + | bars in the center and uniformly oriented bars in the surround, while the other had bars of uniform orientation in the center and | ||
| + | bars of random orientation in the surround. In spite of identical texture contrast at the boundary, the first pattern was judged more | ||
| + | salient than the second and its center took more time to fade. When the surround was decreased in width, fading time followed no systematic | ||
| + | trend and filling-in was increasingly replaced by filling-out. A higher salience and longer fading time for stimuli with a uniformly | ||
| + | as opposed to randomly oriented surround was also obtained when the bars in the center were replaced by dotted arrays. However, no | ||
| + | asymmetry was found for the converse patterns when dots were in the surround and bars in the center. Findings are interpreted in terms | ||
| + | of stronger surround suppression exerted by randomly oriented bars as compared to uniformly oriented bars. Modeling suggests that this | ||
| + | suppression may mediate a statistical computation by the visual system, aimed at detecting a texture boundary between the center and | ||
| + | surround when the center texture was likely generated by a different random process than that which generated the surround. | ||
| + | |||
| + | ===== Information ===== | ||
| + | |||
| ---- dataentry pubitem ---- | ---- dataentry pubitem ---- | ||
| title : Uniform versus random orientation in fading and filling-in | title : Uniform versus random orientation in fading and filling-in | ||
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| year : 2007 | year : 2007 | ||
| created_dt : 2007-01-01 | created_dt : 2007-01-01 | ||
| + | summary_page : publications:fading07 | ||
| keyword_tags : rosenholtz, visstat | keyword_tags : rosenholtz, visstat | ||
| www_url : | www_url : | ||
| - | pdf_url : | + | pdf_url : http://persci.mit.edu/_media/pub_pdfs/attarhamburgerrosenholtzgoetzlspillman2007.pdf |
| pageid : fading07 | pageid : fading07 | ||
| type : publication | type : publication | ||
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