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Subjective contours, tilt aftereffects, and visual cortical organization
M A Paradiso1, S Shimojo, K Nakayama
1Smith-Kettlewell Eye Research Institute, San Francisco, CA 94115.
Vision Research
|January 1, 1989
Summary
The tilt aftereffect (TAE) reveals interactions between real and subjective visual contours. Subjective contours show stronger aftereffects when adapting and testing with subjective lines compared to real lines.
Area of Science:
- Visual perception
- Neuroscience
- Psychophysics
Background:
- The tilt aftereffect (TAE) is a visual illusion.
- Interactions between real and subjective contours are not fully understood.
Purpose of the Study:
- To investigate the interactions between real and subjective contours using the TAE.
- To explore the neural basis of subjective contour perception.
Main Methods:
- Subjects adapted to real or illusory lines.
- Tested with real or illusory lines to measure TAE.
- Measured interocular transfer of TAE.
Main Results:
- Asymmetrical interactions observed: adaptation to real lines produced similar TAEs for real and subjective tests.
- Stronger TAEs occurred with subjective adaptation and subjective tests.
- Weaker TAEs occurred with subjective adaptation and real tests.
- Greater interocular transfer of TAE for subjective test stimuli.
Conclusions:
- Subjective contour perception involves orientation-selective neurons in early visual cortex.
- These neurons are likely more binocular for subjective contours than for real contours.
- Findings align with physiological data on visual cortex cell responses.