Amodal Completion versus Induced Inhomogeneities in the Organization of Illusory Figures

Perception ◽  
1992 ◽  
Vol 21 (5) ◽  
pp. 627-636 ◽  
Author(s):  
Marco Davi ◽  
Baingio Pinna ◽  
Marco Sambin
Keyword(s):  
Phenomenological Model ◽  
Control Experiment ◽  
Amodal Completion ◽  
Brightness Contrast ◽  
Primary Factor ◽  
Paired Comparisons ◽  
Illusory Figure ◽  
Illusory Contours ◽  
Energetic Model ◽  
Method Of Paired Comparisons

An analysis is presented of a phenomenological model of illusory contours. The model is based on amodal completion as the primary factor giving rise to the illusory figure. In the experiment, conducted by the method of paired comparisons, the same parameter was manipulated in two series of equivalent configurations. The first series yielded examples of amodal completion, the second examples of illusory figures. Three groups of subjects evaluated the magnitude of completion, the brightness contrast of the illusory figure, and the contour clarity of the illusory figure. A control experiment was conducted, which demonstrated that in these configurations amodal completion and amodal continuation behave in the same way. Line displacement did not influence the brightness or the contour clarity of the illusory figures, though it influenced the magnitude of amodal completion. These results are in agreement with the energetic model developed by Sambin.

Scaling Children's Incentives by the Method of Paired Comparisons

1960 ◽  
Vol 7 (3) ◽  
pp. 471-474 ◽  
Author(s):  
Sam L. Witryol ◽  
William F. Fischer
Keyword(s):  
Paired Comparisons ◽  
Method Of Paired Comparisons

Amodal Completion and the Perception of Depth without Binocular Correspondence

Perception ◽  
10.1068/p3305 ◽  
2002 ◽  
Vol 31 (9) ◽  
pp. 1037-1045 ◽  
Author(s):  
Benoit A Bacon ◽  
Pascal Mamassian
Keyword(s):  
Amodal Completion ◽  
Correspondence Problem ◽  
Illusory Contours ◽  
Binocular Matching ◽  
Partially Occluded ◽  
Global Surface

Half-occlusions and illusory contours have recently been used to show that depth can be perceived in the absence of binocular correspondence and that there is more to stereopsis than solving the correspondence problem. In the present study we show a new way for depth to be assigned in the absence of binocular correspondence, namely amodal completion. Although an occluder removed all possibility of direct binocular matching, subjects consistently assigned the correct depth (convexity or concavity) to partially occluded ‘folded cards’ stimuli. Our results highlight the importance of more global, surface-based processes in stereopsis.

An Investigation of Shapes for Warning Labels

1981 ◽  
Vol 25 (1) ◽  
pp. 395-399 ◽  
Author(s):  
David J. Cochran ◽  
Michael W. Riley ◽  
Eileen I. Douglass
Keyword(s):  
College Students ◽  
Binomial Test ◽  
Paired Comparisons ◽  
Warning Labels ◽  
Geometric Shapes ◽  
The Difference ◽  
Method Of Paired Comparisons

An examination was made of nineteen different geometric shapes of warning labels, using the method of paired comparisons. Sixty-six college students viewed slides of all pairs of the shapes and each time selected the shape that was the better indicator of warning. The binomial test was used to statistically test the difference between the shapes. Results showed that of the shapes tested, the triangle on its vertex (yield sign shape, ∇) was the best warning indicator.

scholarly journals Evaluation of Motion Correction Processing in Equine Bone Scintigraphy by Scheff^|^eacute;^|^rsquo;s Method of Paired Comparisons

2013 ◽  
Vol 75 (3) ◽  
pp. 369-371 ◽  
Author(s):  
Toshiro YAMAGUCHI ◽  
Yoshiro ENDO ◽  
Yasuo NAMBO ◽  
Fumio SATO ◽  
Naoki SASAKI ◽  
...  
Keyword(s):  
Bone Scintigraphy ◽  
Motion Correction ◽  
Paired Comparisons ◽  
Method Of Paired Comparisons ◽  
Equine Bone

Illusory Contours from Pictorially Three-Dimensional Inducing Elements: Counterevidence for Parks and Rock's Example

Perception ◽  
1993 ◽  
Vol 22 (7) ◽  
pp. 809-818 ◽  
Author(s):  
Franco Purghé
Keyword(s):  
Three Dimensional ◽  
Illusory Figure ◽  
Illusory Contours ◽  
Line Elements

In 1990 Parks and Rock claimed that, in pictorially three-dimensional (3-D) inducing patterns, an illusory figure does not emerge if a clear occlusion event is not present. A new pictorially 3-D pattern is presented which contradicts this claim. Two experiments were carried out. The first was aimed at ascertaining the presence of an illusory figure in the new 3-D pattern; the second was aimed at offering evidence that in Parks and Rock's pattern the disappearance of the illusory figure could be due to local interferences caused by the line elements in contact with the inducing borders. The results tend to contradict Parks and Rock's conclusions.

On the Microgenesis of Illusory Figures: A Failure to Replicate

Perception ◽  
1994 ◽  
Vol 23 (7) ◽  
pp. 857-862 ◽  
Author(s):  
Theodore E Parks
Keyword(s):  
Problem Solving ◽  
Viewing Time ◽  
Illusory Figure ◽  
Illusory Contours ◽  
Do So

Reynolds found in 1981 that with increased viewing time of a pattern which may or may not produce illusory contours there were: first, reports of the pattern without an illusory figure; then, at longer exposures, an increase in the frequency with which illusory figures were reported; and then, with still longer exposures, a decrease in such reports if the pattern contained elements which tended to contradict the possibility of such a figure. Unfortunately, however, three attempts to replicate these potentially very important findings—with the aid of substantially improved methodology—consistently failed to do so. It is suggested that this failure, although it is disappointing to those who subscribe to a ‘problem solving’ explanation of illusory contours, may not constitute a strong refutation of such a theory. Regardless, the purpose in the report is to clarify and rectify the published record concerning this part of the evidential underpinnings of that theory.

scholarly journals Amodal completion as a basis for illusory contours

1983 ◽  
Vol 33 (4) ◽  
pp. 355-364 ◽  
Author(s):  
R. H. Day ◽  
R. T. Kasperczyk
Keyword(s):  
Amodal Completion ◽  
Illusory Contours
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