Peripheral contour integration is biased towards convex contours B Machilsen, M Demeyer, J Wagemans |
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Laboratory of Experimental Psychology, University of Leuven (KU Leuven), Belgium
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| Integrating local edges into spatially extended contours is a fundamental step in perceptual organization. This process of contour integration is known to depend on the local alignment and relative spacing of adjacent contour elements. To investigate how the global curvature polarity of a contour influences contour integration in the visual periphery, we embedded circular arc contours in a field of randomly positioned Gabor elements. These contours could appear at three different eccentricities and were either convex or concave with respect to the central fixation position. Participants were instructed to indicate whether the contour appeared in the right or in the left half of the display. Peripherally presented convex contours were detected faster than concave contours at all three eccentricities. |
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