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[Apparent depth by the stereograms without binocular retinal disparity: is Lau effect artifact?]
T Yanagida1, M Haraguchi, K Shimono
1Department of Psychology, Kyushu University, Fukuoka.
Shinrigaku Kenkyu : the Japanese Journal of Psychology
|October 1, 1992
Summary
Perceived depth from Zöllner figures presented to different eyes isn't due to phenomenal disparity. Most observers' depth perceptions didn't align with this theory, suggesting other visual processing mechanisms are involved.
Area of Science:
- Visual perception
- Binocular vision
- Illusory figures
Context:
- The Zöllner figure is known to induce visual illusions.
- Previous research suggests phenomenal disparity might explain depth perception with such figures.
- This study investigates a specific dichoptic presentation of the Zöllner figure.
Purpose:
- To test the hypothesis that perceived depth in a dichoptically presented Zöllner figure arises from phenomenal disparity.
- To determine if observers' depth judgments align with the concept of phenomenal disparity.
Summary:
- Seventeen observers viewed Zöllner figures dichoptically, with one eye seeing the figure and the other seeing principal lines.
- Participants reported perceived depth and relative proximity of lines.
- Only 9% of responses supported the phenomenal disparity hypothesis, despite depth being reported.
Impact:
- Findings challenge the role of phenomenal disparity in depth perception for this specific visual stimulus.
- Suggests that dichoptic presentation of Zöllner figures may not solely rely on binocular disparity processing.
- Opens avenues for exploring alternative explanations for depth perception in illusory figures.