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publications:fading07 [2010/06/09 15:48] external edit
publications:fading07 [2012/04/20 11:09] (current)
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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 ----
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year         : 2007 year         : 2007
created_dt   : 2007-01-01 created_dt   : 2007-01-01
-keyword_tags : rosenholtz+summary_page : publications:fading07 
 +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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publications/fading07.1276112936.txt.gz · Last modified: 2010/11/05 12:14 (external edit)