A series of lines pointing towards a central region induces an illusory brightness effect that is systematically related to the angle formed by the lines and the contour of the illusory brightness. As the lines veer to become tangents the illusory brightness decreases.
KanizsaG, 1974“Contours without gradients or cognitive contours?”Italian Journal of Psychology2107–123
3.
KanizsaG, 1976“Subjective contours”Scientific American234 April 48–52
4.
KennedyJ M, 1975“Depth at an edge, coplanarity, slant depth, change in direction and change in brightness in the production of subjective contours”Italian Journal of Psychology2107–123
5.
KennedyJ M, 1976“Sun figure: an illusory diffuse contour resulting from an arrangement of dots”Perception5479–481
6.
KennedyJ M, 1978“Illusory contours not due to completion”Perception7187–189
7.
KennedyJ MLeeH, 1976“A figure-density hypothesis and illusory contour brightness”Perception5387–392
8.
WareCKennedyJ M, 1977“Illusory line linking solid rods”Perception6601–602
9.
WareCKennedyJ M, 1978“Perception of subjective lines, surfaces and volumes in 3-dimensional constructions”Leonardo11111–114
