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Colour at edges and colour spreading in McCollough effects
J Broerse1, T Vladusich, R P O'Shea
1Department of Psychology, University of Queensland, St. Lucia, Australia. broerse@psy.uq.edu.au
Vision Research
|May 27, 1999
Summary
Subjective colors in McCollough effects (MEs) have two components: edge and spread colors. Experiments show color-fringed gratings simulate MEs, suggesting edge colors correct chromatic aberration and spread colors aid color constancy.
Area of Science:
- Visual perception
- Neuroscience
- Color vision
Background:
- McCollough effects (MEs) involve subjective colors after adaptation to specific color-contingent stimuli.
- Previous models propose MEs comprise edge and spread color components.
Purpose of the Study:
- To experimentally test the two-component model of McCollough effects (MEs).
- To investigate the roles of edge and spread colors in MEs and their relationship to visual processing mechanisms.
Main Methods:
- Utilized color-fringed gratings and uniformly-colored gratings to induce and quantify MEs.
- Varied grating duty cycles to analyze the contribution of edge and spread colors.
- Compared MEs induced by different grating types and analyzed perceived color magnitudes.
Main Results:
- Color-fringed gratings induced MEs comparable in strength to traditional gratings.
- Edge color magnitude remained constant across conditions.
- Spread color magnitude varied with duty cycle, decreasing as duty cycle increased for color-fringed gratings and MEs.
Conclusions:
- Confirms that MEs can be simulated by color-fringed gratings, supporting the two-component model.
- Proposes edge colors result from chromatic aberration correction and spread colors from a color constancy filling-in process.
- Suggests a framework based on neural receptive fields for understanding these visual phenomena.