Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/25002
Appears in Collections:Psychology Journal Articles
Peer Review Status: Refereed
Title: Dynamics of contextual modulation of perceived shape in human vision
Authors: Gheorghiu, Elena
Kingdom, Frederick A A
Contact Email: elena.gheorghiu@stir.ac.uk
Keywords: shape
contour
texture
surround suppression
motion
temporal frequency
temporal phase
adaptation
aftereffect
Issue Date: 23-Feb-2017
Citation: Gheorghiu E & Kingdom FAA (2017) Dynamics of contextual modulation of perceived shape in human vision, Scientific Reports, 7, Art. No.: 43274.
Abstract: In biological vision, contextual modulation refers to the influence of a surround pattern on either the perception of, or the neural responses to, a target pattern. One studied form of contextual modulation deals with the effect of a surround texture on the perceived shape of a contour, in the context of the phenomenon known as the shape aftereffect. In the shape aftereffect, prolonged viewing, or adaptation to a particular contour’s shape causes a shift in the perceived shape of a subsequently viewed contour. Shape aftereffects are suppressed when the adaptor contour is surrounded by a texture of similarly-shaped contours, a surprising result given that the surround contours are all potential adaptors. Here we determine the motion and temporal properties of this form of contextual modulation. We varied the relative motion directions, speeds and temporal phases between the central adaptor contour and the surround texture and measured for each manipulation the degree to which the shape aftereffect was suppressed. Results indicate that contextual modulation of shape processing is selective to motion direction, temporal frequency and temporal phase. These selectivities are consistent with one aim of vision being to segregate contours that define objects from those that form textured surfaces.
DOI Link: http://dx.doi.org/10.1038/srep43274
Rights: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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