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Photopic visual phantom illusion: its common and unique characteristics as a completion effect.
A Kitaoka1, J Gyoba, H Kawabata
1Department of Behavioral Physiology, Tokyo Metropolitan Institute for Neuroscience, Japan. akitaoka@tmin.ac.jp
Perception
|February 9, 2000
Summary
Researchers report a new visual illusion, the photopic phantom illusion, seen in bright light. This illusion involves a faint, phantom grating appearing over an occluding region, similar to previously observed scotopic phantoms.
Area of Science:
- Visual perception
- Psychophysics
- Optical illusions
Background:
- The stationary visual phantom illusion was previously reported by Gyoba (1983).
- Illusory perception can occur under various lighting conditions.
Purpose of the Study:
- To report and characterize a novel visual illusion observed in photopic (bright light) conditions.
- To compare the properties of this new illusion with previously documented scotopic (dim light) phantoms.
Main Methods:
- A typical example involves a square-wave grating occluded by a black region.
- Measurement of critical spatial frequencies for the photopic phantom illusion.
- Comparison of photopic and scotopic phantom spatial frequencies.
Main Results:
- A phantom grating with clear contours but reduced contrast is perceived across the occluding region.
- The critical spatial frequencies of photopic phantoms closely resemble those of scotopic phantoms.
- The illusion is observable in photopic vision.
Conclusions:
- The newly identified 'photopic phantom illusion' shares significant characteristics with scotopic phantoms.
- The illusion's properties are discussed concerning perceptual transparency, stereoscopic viewing, and completion mechanisms.