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http://hdl.handle.net/1893/20539| Appears in Collections: | Psychology Journal Articles |
| Peer Review Status: | Refereed |
| Title: | Chromatic tuning of contour-shape mechanisms revealed through the shape-frequency and shape-amplitude after-effects |
| Author(s): | Gheorghiu, Elena Kingdom, Frederick A A |
| Contact Email: | elena.gheorghiu@stir.ac.uk |
| Keywords: | Color Contrast-polarity Shape Adaptation Shape-frequency after-effect Shape-amplitude after-effect |
| Issue Date: | Jun-2007 |
| Date Deposited: | 25-Jun-2014 |
| Citation: | Gheorghiu E & Kingdom FAA (2007) Chromatic tuning of contour-shape mechanisms revealed through the shape-frequency and shape-amplitude after-effects. Vision Research, 47 (14), pp. 1935-1949. https://doi.org/10.1016/j.visres.2007.03.010 |
| Abstract: | We investigated whether contour-shape processing mechanisms are selective for color direction using the shape-frequency and shape-amplitude after-effects, or SFAE and SAAE [Gheorghiu, E. & Kingdom, F. A. A. (2006). Luminance-contrast properties of contour-shape processing revealed through the shape-frequency after-effect. Vision Research, 46(21), 3603-3615. Gheorghiu, E. & Kingdom, F. A. A. (2007). The spatial feature underlying the shape-frequency and shape-amplitude after-effects. Vision Research, 47(6), 834-844]. All contours were defined along the 'red-green', 'blue-yellow' and 'luminance' axes of cardinal color space. Adapting and test contours were defined along the same or along opposite polarities within a cardinal axis, and along the same or along different cardinal axes. We found (i) little transfer of the after-effects across different within-axis polarities, for all cardinal axes and for both even-symmetric and odd-symmetric contours; (ii) little transfer between the red-green and blue-yellow cardinal axes; (iii) little transfer between the chromatic and luminance cardinal directions for the SAAE; (iv) large transfer between the chromatic and luminance cardinal directions for the SFAE. We conclude that contour-shape mechanisms are selective for within-cardinal axis polarity and for the chromatic axes within the isoluminant plane. However for certain types of contour-shape processing they are poorly selective along the chromatic versus luminance dimension. Overall our results suggest that contour-shape encoding mechanisms are selective for color direction and that color is important for contour-shape processing. |
| DOI Link: | 10.1016/j.visres.2007.03.010 |
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| Gheorghiu and Kingdom (2007).pdf | Fulltext - Published Version | 402.36 kB | Adobe PDF | Under Permanent Embargo Request a copy |
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