scholarly journals Capture of stereopsis and apparent motion by illusory contours

1986 ◽  
Vol 39 (5) ◽  
pp. 361-373 ◽  
Author(s):  
V. S. Ramachandran
Keyword(s):  
Apparent Motion ◽  
Illusory Contours

Apparent Motion of Subjective Surfaces

Perception ◽  
1985 ◽  
Vol 14 (2) ◽  
pp. 127-134 ◽  
Author(s):  
Vilayanur S Ramachandran
Keyword(s):  
Visual Field ◽  
Motion Capture ◽  
Apparent Motion ◽  
Regular Matrix ◽  
Illusory Contours ◽  
Salient Features ◽  
Subjective Surfaces

Apparent motion of an illusory surface was produced by presenting two spatially separated illusory squares in an appropriately timed sequence. Control experiments showed that the effect arose from the illusory contours themselves and not from motion of the cut sectors on the discs. When a template of this movie was superimposed on ‘wallpaper’ composed of a regular matrix of spots, the spots appeared to move with the illusory surface even though they were physically stationary. This effect (‘motion capture’) suggests that the motion of certain salient features in the visual field gets spontaneously attributed to even static elements in the vicinity.

Flank Transparency: The Effects of Gaps, Line Spacing, and Apparent Motion

Perception ◽  
10.1068/p3410 ◽  
2002 ◽  
Vol 31 (9) ◽  
pp. 1073-1092 ◽  
Author(s):  
Daniel Wollschläger ◽  
Antonio M Rodriguez ◽  
Donald D Hoffman
Keyword(s):  
Apparent Motion ◽  
Spatial Extent ◽  
Illusory Contours ◽  
Spreading Effect ◽  
Color Spreading ◽  
Line Spacing ◽  
Neon Color Spreading

We analyze the properties of a dynamic color-spreading display created by adding narrow colored flanks to rigidly moving black lines where these lines fall in the interior of a stationary virtual disk. This recently introduced display (Wollschläger et al, 2001 Perception30 1423–1426) induces the perception of a colored transparent disk bounded by strong illusory contours. It provides a link between the classical neon-color-spreading effect and edge-induced color spreading as discussed by Pinna et al (2001 Vision Research41 2669–2676). We performed three experiments to quantitatively study (i) the enhancing influence of apparent motion; (ii) the degrading effect of small spatial discontinuities (gaps) between lines and flanks; and (iii) the spatial extent of the color spreading. We interpret the results as due to varying degrees of objecthood of the dynamically specified disk: increased objecthood leads to increased surface visibility in both contour and color.

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