Local and non-local effects on surface-mediated stereoscopic depth.

Area of Science:

• Vision Science
• Perceptual Psychology
• Computational Neuroscience

Background:

• Stereoscopic depth perception relies on disparity relative to a background.
• Underestimating background slant introduces bias in the probe's point of subjective equality (PSE).

Purpose of the Study:

• To investigate how remote surfaces influence probe PSE through their effect on perceived background slant.
• To elucidate the mechanisms of visual depth perception and spatial bias.

Main Methods:

• Utilized random dot stereograms to manipulate background and flanking surface slant.
• Measured probe PSE under conditions with and without flanking surfaces of varying slant and separation.
• Analyzed the influence of surface contiguity and separation on perceived depth bias.

Main Results:

• Remote surfaces bias probe PSE by altering perceived background slant.
• Placing frontal flanking surfaces increased perceived background slant, reducing probe bias.
• Flankers' influence on probe bias was mediated by a central background surface and diminished with separation.

Conclusions:

• Stereoscopic depth perception is influenced by background surfaces, neighboring surfaces, and distant surfaces.
• Perceived slant of background and flanking surfaces significantly modulates depth judgments.
• Visual depth perception involves complex interactions between multiple surfaces at varying distances.