scholarly journals The role of shape-from-shading information in the perception of local and global form in Glass patterns

2011 ◽  
Vol 11 (7) ◽  
pp. 20-20 ◽  
Author(s):  
S. K. Khuu ◽  
A. Moreland ◽  
J. Phu
Keyword(s):  
Shape From Shading ◽  
Global Form ◽  
Glass Patterns

Temporal characteristics of global form perception in translational and circular Glass patterns

2021 ◽  
Vol 187 ◽  
pp. 102-109
Author(s):  
Rita Donato ◽  
Andrea Pavan ◽  
Jorge Almeida ◽  
Massimo Nucci ◽  
Gianluca Campana
Keyword(s):  
Form Perception ◽  
Temporal Characteristics ◽  
Global Form ◽  
Glass Patterns

scholarly journals Temporal summation of global form signals in dynamic Glass patterns

2015 ◽  
Vol 107 ◽  
pp. 30-35 ◽  
Author(s):  
Jean-François Nankoo ◽  
Christopher R. Madan ◽  
Marcia L. Spetch ◽  
Douglas R. Wylie
Keyword(s):  
Temporal Summation ◽  
Global Form ◽  
Glass Patterns

Does Face Recognition Rely on Encoding of 3-D Surface? Examining the Role of Shape-from-Shading and Shape-from-Stereo

Perception ◽  
10.1068/p3065 ◽  
2000 ◽  
Vol 29 (6) ◽  
pp. 729-743 ◽  
Author(s):  
Chang Hong Liu ◽  
Charles A Collin ◽  
Avi Chaudhuri
Keyword(s):  
Face Recognition ◽  
Shape From Shading ◽  
Minor Role ◽  
Weighted Function ◽  
Pattern Processing ◽  
Shape Processing ◽  
Face Stimuli ◽  
Shading Effects ◽  
A Minor

It is now well known that processing of shading information in face recognition is susceptible to bottom lighting and contrast reversal, an effect that may be due to a disruption of 3-D shape processing. The question then is whether the disruption can be rectified by other sources of 3-D information, such as shape-from-stereo. We examined this issue by comparing identification performance either with or without stereo information using top-lit and bottom-lit face stimuli in both photographic positive and negative conditions. The results show that none of the shading effects was reduced by the presence of stereo information. This finding supports the notion that shape-from-shading overrides shape-from-stereo in face perception. Although shape-from-stereo did produce some signs of facilitation for face identification, this effect was negligible. Together, our results support the view that 3-D shape processing plays only a minor role in face recognition. Our data are best accounted for by a weighted function of 2-D processing of shading pattern and 3-D processing of shapes, with a much greater weight assigned to 2-D pattern processing.

scholarly journals Limited Attention Diminishes Spatial Suppression From Large Field Glass Patterns

Perception ◽  
2019 ◽  
Vol 48 (4) ◽  
pp. 286-315 ◽  
Author(s):  
Andrea Pavan ◽  
Adriano Contillo ◽  
Filippo Ghin ◽  
Matthew J. Foxwell ◽  
George Mather
Keyword(s):  
Large Scale ◽  
Spatial Summation ◽  
Visual Presentation ◽  
Large Field ◽  
Limited Attention ◽  
Adaptation Period ◽  
After Effect ◽  
Glass Patterns ◽  
Coherence Level

Glass patterns (GPs) consist of randomly distributed dot pairs (dipoles) whose orientations are determined by specific geometric transforms. We investigated the role of visuospatial attention in the processing of global form from GPs by measuring the effect of distraction on adaptation to GPs. In the nondistracted condition, observers were adapted to coherent GPs. After the adaptation period, they were presented with a test GP divided in two halves along the vertical and were required to judge which side of the test GP was more coherent. In the attention-distracted condition, a high-load rapid serial visual presentation task was performed during the adapting period. The magnitude of the form after-effect was measured using a technique that measures the coherence level at which the test GP appears random. The rationale was that if attention has a modulatory effect on the spatial summation of dipoles, in the attention-distracted condition, we should expect a weaker form after-effect. However, the results showed stronger form after-effect in the attention-distracted condition than in the nondistracted condition, suggesting that distraction during adaptation increases the strength of form adaptation. Additional experiments suggested that distraction may reduce the spatial suppression from large-scale textures, strengthening the spatial summation of local-oriented signals.

scholarly journals Sensitivity to global form in glass patterns after early visual deprivation in humans

2002 ◽  
Vol 42 (8) ◽  
pp. 939-948 ◽  
Author(s):  
Terri L Lewis ◽  
Dave Ellemberg ◽  
Daphne Maurer ◽  
Fran Wilkinson ◽  
Hugh R Wilson ◽  
...  
Keyword(s):  
Visual Deprivation ◽  
Global Form ◽  
Glass Patterns

A Window on the Normal Development of Sensitivity to Global Form in Glass Patterns

Perception ◽  
10.1068/p5189 ◽  
2004 ◽  
Vol 33 (4) ◽  
pp. 409-418 ◽  
Author(s):  
Terri L Lewis ◽  
Dave Ellemberg ◽  
Daphne Maurer ◽  
Melanie Dirks ◽  
Fran Wilkinson ◽  
...  
Keyword(s):  
Normal Development ◽  
Global Form ◽  
Glass Patterns

scholarly journals Interplay between pattern density and global form in Glass patterns

2010 ◽  
Vol 8 (6) ◽  
pp. 724-724
Author(s):  
I. Kurki ◽  
J. Saarinen
Keyword(s):  
Global Form ◽  
Pattern Density ◽  
Glass Patterns
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