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Default Reference Frames for Angular Expansion in the Perception of Visual Direction
Prince U D Tardeh1, Crystal Xu1, Frank H Durgin1
1Department of Psychology, Swarthmore College, 500 College Ave., Swarthmore, PA 19081, USA.
Vision (Basel, Switzerland)
|March 27, 2024
Summary
Perception of 3D space exaggerates angular elevation, even without visual gravity cues. This spatial distortion appears to be a default, suggesting the gravitational frame is a primary reference.
Area of Science:
- Visual perception
- Spatial cognition
- Human psychophysics
Background:
- Previous research indicates perceived angular elevation is exaggerated (gain ~1.5) relative to a visible horizon.
- The role of visual gravitational references in this perceptual exaggeration is not fully understood.
Purpose of the Study:
- To investigate if angular elevation estimates remain exaggerated without a visual gravitational reference.
- To determine if spatial perception distortions are a default in 3D environments.
Main Methods:
- Five experiments were conducted using a novel apparatus for viewing stereoscopic virtual environments.
- Participants (N=133) were positioned supine, looking upward.
- Magnitude estimation and psychometric matching methods were employed.
Main Results:
- Exaggerated scaling of elevation was consistently found, even in nearly empty virtual environments.
- Supine observers showed exaggerated azimuthal judgments when looking upward.
- Findings suggest elevation exaggeration is a default characteristic of 3D spatial perception.
Conclusions:
- The exaggeration of perceived angular elevation appears to be a default for three-dimensional space perception.
- The gravitational frame of reference likely plays a fundamental role, influencing spatial judgments even in its absence.
- This suggests a robust, ingrained mechanism for processing spatial orientation.
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