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Fig. 13.2. Association fields for contour integration. The circular disks with black and white oriented bars represent Gabor wavelets, which is the typical input contour element used in the study by Field et al. (1993). Whether the elements interact depends on two factors: (a) The elements' positions have to be located on smooth (collinear or cocircular) contour, and (b) their orientations have to be parallel to the smooth contour. The solid lines indicate cases where integration occurs, and the dashed lines those where it does not. Adapted from Field et al. (1993).