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- W2056566118 abstract "Neurons in the early stages of visual processing are often thought of as edge detectors for different orientations. Here we investigate the existence of detectors for specific combinations of edges—detectors for specific curvatures. Previous attempts to demonstrate such detectors through aftereffects have ultimately been explained by adaptation to local orientation rather than curvature per se. To control for local aftereffects, we adapted one patch of visual field to two adjacent gratings presented as an obtuse contour (compound patch), and another patch to the same component gratings presented alternately (component patch). In this way both patches are adapted equally to the local orientation components of the stimuli, but only the compound patch is adapted to the global contour. Thus any difference in adaptation between the patches must result from the presence of the contour as a global figure. We found that perceived contrast of probe stimuli was not differentially altered in the two patches. However, apparent curvature of the probes was consistently greater in the compound patch than in the component patch. This effect was considerably reduced by increasing the spatial separation of the component gratings. The results are consistent with curvature detectors involved in the perceptual grouping of edges." @default.
- W2056566118 created "2016-06-24" @default.
- W2056566118 creator A5043072264 @default.
- W2056566118 creator A5086413574 @default.
- W2056566118 date "2008-06-03" @default.
- W2056566118 modified "2023-09-24" @default.
- W2056566118 title "Selective mechanisms for simple contours revealed by compound adaptation" @default.
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- W2056566118 doi "https://doi.org/10.1167/8.7.11" @default.
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