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Instability in triangular-wave gratings: a role for perceptual inferences?
Perception
|January 1, 1983
Summary
A triangular-wave grating can be perceived in multiple ways, sometimes appearing bistable. Visual cues can influence which perception is dominant, suggesting higher-level brain processes are involved in this perceptual instability.
Area of Science:
- Visual Perception
- Cognitive Neuroscience
- Psychophysics
Background:
- A grating with a triangular-wave luminance profile has been reported to exhibit perceptual instability.
- This grating can be perceived veridically or as a percept resembling a square wave, indicating bistability.
Purpose of the Study:
- To investigate the phenomenon of perceptual instability in a triangular-wave luminance grating.
- To explore additional percepts experienced with this grating.
- To examine the influence of illumination cues on perceptual dominance.
Main Methods:
- Presentation of a triangular-wave luminance grating to participants.
- Observation and reporting of experienced percepts.
- Manipulation of physically present or inferred illumination cues.
- Analysis of the relative dominance of different percepts.
Main Results:
- The triangular-wave grating was found to be bistable, fluctuating between veridical and square-wave-like percepts.
- Several additional percepts were reported by observers.
- The dominance of specific percepts was altered by illumination cues.
Conclusions:
- The observed perceptual instability and cue-influenced dominance suggest the involvement of higher-level cognitive processes.
- This phenomenon represents a novel form of perceptual instability in visual processing.