Tolerance for local and global differences in the integration of shape information.

摘要: Shape is a critical cue to object identity. In psychophysical studies, radial frequency (RF) patterns, paths deformed from circular by sinusoidal modulation of radius, have proved valuable stimuli for the demonstration global integration local shape information. Models mechanism focused on periodicity in measures curvature pattern, despite fact that other properties covary. We show patterns defined rectified also exhibit and are indistinguishable conventional RF at their thresholds detection, demonstrating some indifference modulating function. Further, irregular incorporating four different frequencies globally integrated, indicating uniform not critical. Irregular can be handed sense mirror images cannot superimposed. same pattern could discriminated near detection. The with cycles constant completing 2π radians were, however, perfectly discriminated, existence discrete representations these which they discriminated. It has previously been shown but numbers were not. conclude such identified, threshold, set angles subtended center adjacent points maximum convex curvature.