Filling-in with colour: different modes of surface completion

Area of Science:

• Visual Perception
• Neuroscience
• Color Science

Background:

• Figure-ground organization influences visual perception.
• Color filling-in is a perceptual phenomenon where a region takes on the color of its surroundings.
• Understanding filling-in dynamics is crucial for comprehending neural processing in vision.

Purpose of the Study:

• To investigate the figural dynamics of color filling-in processes.
• To identify and characterize different modes of color spreading in ambiguous figures.
• To explore the influence of color properties and stimulus configurations on filling-in.

Main Methods:

• Utilized stimuli with multiple possible figure-ground organizations, including concentric rings, nested squares, and parallel stripes.
• Employed equiluminant color combinations to test color filling-in.
• Observed and categorized four distinct modes of color filling-in (M1-M4).

Main Results:

• Identified four modes of color filling-in, including a novel two-step process (M3).
• Demonstrated both centripetal and centrifugal color spreading.
• Found that red and yellow were stronger inducers than blue and green, which were filled-in more easily.
• Observed no color mixture, suggesting a long-range neural process.

Conclusions:

• Color filling-in exhibits complex dynamics and multiple modes of operation.
• The direction of color spreading (centripetal/centrifugal) depends on stimulus configuration.
• Color properties influence the induction and ease of filling-in.
• Results suggest an underlying long-range neural mechanism for color filling-in.