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Visually perceived eye level with reversible pitch stimuli: implications for the great circle and implicit surface
B Robert Post1, Jacque M Teague, Robert B Welch
1Department of Psychology, 1 Shields Avenue, University of California at Davis, Davis, CA 95616, USA. rbpost@ucdavis.edu
Perception
|December 4, 2003
Summary
Visually perceived eye level (VPEL) and perceived pitch are distinct perceptions. This study shows VPEL shifts are not solely determined by retinal image orientation, suggesting independent processing.
Area of Science:
- Vision science
- Perceptual psychology
Background:
- Understanding visual perception of spatial orientation is crucial.
- Visually perceived eye level (VPEL) and perceived pitch are key components of spatial orientation.
Purpose of the Study:
- To investigate the relationship between perceived pitch and VPEL.
- To determine if VPEL is solely dependent on retinal image orientation.
Main Methods:
- Subjects viewed two sets of vertical line stimuli at various pitch angles.
- Perceived pitch and VPEL were measured under monocular and binocular viewing conditions.
Main Results:
- VPEL shifts were consistent with physical pitch, even when perceived pitch was dissociated.
- Monocular viewing revealed a dissociation between perceived pitch and VPEL shifts.
- Binocular viewing normalized perceived pitch and VPEL, despite retinal image orientations suggesting otherwise.
Conclusions:
- Perceived pitch and VPEL are processed independently.
- The hypothesis that VPEL differences are solely based on retinal image orientation is not supported.