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Updated: May 1, 2026
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Spatial selectivity of the watercolor effect.
Summary
The watercolor effect (WCE) is spatially selective, with its strength depending on contour width and configuration. Optimal WCE occurs with equally wide contours, suggesting a link to V1 neural substrates.
Area of Science:
- Visual perception
- Neuroscience
- Computational vision
Background:
- The watercolor effect (WCE) is a perceptual phenomenon involving illusory color filling-in.
- Understanding the spatial properties of WCE is crucial for elucidating its underlying neural mechanisms.
Purpose of the Study:
- To investigate the spatial selectivity of the watercolor effect (WCE).
- To determine how WCE strength is influenced by luminance contrast and spatial configuration of inducing contours.
Main Methods:
- Utilized a maximum likelihood scaling procedure to measure WCE strength.
- Assessed WCE strength across varying luminance contrasts and spatial configurations of inducing contours.
Main Results:
- WCE strength demonstrated narrow tuning to the width of inducing contours.
- Optimal WCE strength was observed when inducing contours were of equal width.
- Stimulus size variation could enhance WCE strength when contour width was suboptimal.
Conclusions:
- The spatial selectivity of WCE suggests a neural basis with characteristics similar to double-opponent, color-luminance cells in V1.
- Findings support the role of specific neural substrates in the generation of the watercolor effect.
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