Abstract
We compare two versions of two known phenomena, the Curvature blindness and the Kite mesh illusions, to highlight how similar manipulations lead to blindness to curvature and blindness to illusory curvature, respectively. The critical factor is a change in luminance polarity; this factor interferes with the computation of curvature along the contour, for both real and illusory curvature.
Highlights
One way to describe the Curvature blindness illusion is in terms of average contour along the segments
In the case of the Curvature blindness illusion, the misperception of curvature emerges when there is a change of luminance polarity at the turning point
Integration of contour curvature information is constrained by polarity
Summary
One way to describe the Curvature blindness illusion is in terms of average contour along the segments. When the lines going toward the right are of a different colour compared to the lines going to the left (Figure 3, panel (b)), the bending illusion may even appear stronger.
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