Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/30301
Appears in Collections:Psychology Journal Articles
Peer Review Status: Refereed
Title: Luminance-contrast properties of texture-shape and texture-surround suppression of contour shape
Author(s): Gheorghiu, Elena
Kingdom, Frederick
Contact Email: elena.gheorghiu@stir.ac.uk
Keywords: shape
contour
texture
surround suppression
luminance polarity
contrast
aftereffects
Issue Date: Oct-2019
Citation: Gheorghiu E & Kingdom F (2019) Luminance-contrast properties of texture-shape and texture-surround suppression of contour shape. Journal of Vision, 19 (12), Art. No.: 4. https://doi.org/10.1167/19.12.4
Abstract: Studies have revealed that textures suppress the processing of the shapes of contours they surround. One manifestation of texture-surround suppression is the reduction in the magnitude of adaptation-induced contour-shape aftereffects when the adaptor contour is surrounded by a texture. Here we utilize this phenomenon to investigate the nature of the first-order inputs to texture-surround suppression of contour-shape, by examining its selectivity to luminance-polarity and the magnitude of luminance contrast. Stimuli were constructed from sinusoidal-shaped strings of either ‘bright’ or ‘dark’ elongated Gaussians. Observers adapted to pairs of contours and the aftereffect was measured as the shift in the apparent shape-frequency of subsequently presented test-contours. We found that the suppression of the contour-shape aftereffect by a surround texture made of similar contours was maximal when the adaptor’s center and surround contours were of the same polarity, revealing polarity specificity of the surround-suppression effect. We also measured the effect of varying the relative contrasts of the adaptor’s center and surround and found that the reduction in the contour-shape aftereffect was determined by the surround-to-center contrast ratio. Finally, we measured the selectivity to luminance polarity of the texture-shape aftereffect itself and found that it was reduced when the adaptors and tests were of opposite luminance-polarity. We conclude that texture-surround suppression of contour-shape, as well as texture-shape processing itself, depend on ‘On-Off’ luminance-polarity channel interactions. These selectivities may constitute an important neural substrate underlying efficient figure-ground segregation and image segmentation.
DOI Link: 10.1167/19.12.4
Rights: Copyright 2019 The Authors This work is licensed under a Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/).
Licence URL(s): http://creativecommons.org/licenses/by/4.0/

Files in This Item:
File Description SizeFormat 
Gheorghiu_Kingdom (2019).pdfFulltext - Published Version1.84 MBAdobe PDFView/Open



This item is protected by original copyright



A file in this item is licensed under a Creative Commons License Creative Commons

Items in the Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

If you believe that any material held in STORRE infringes copyright, please contact library@stir.ac.uk providing details and we will remove the Work from public display in STORRE and investigate your claim.