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Published on: October 27, 2016
Border-ownership-dependent tilt aftereffect in incomplete figures
Tadashi Sugihara1, Yoshihisa Tsuji, Ko Sakai
1The Zanvyl Krieger Mind/Brain Institute, The Johns Hopkins University, MD 21218, USA.
Summary
Neural coding for border ownership (BO) helps segregate figures from backgrounds. This study found that the BO-dependent tilt aftereffect (BO-TAE) persists even with ambiguous contours, suggesting a contour-independent mechanism for BO coding.
Area of Science:
- Neuroscience
- Computational Neuroscience
- Visual Perception
Background:
- Neural coding for border ownership (BO) is a potential basis for figure-ground segregation.
- BO defines the directional relationship between a figure and its border.
Purpose of the Study:
- To investigate the neural mechanisms underlying border ownership (BO).
- To explore the robustness of the BO signal by examining the BO-dependent tilt aftereffect (BO-TAE) under conditions where gestalt factors are disrupted.
Main Methods:
- Psychophysical investigation using stimulus configurations designed to activate BO circuitry.
- Examined the presence of the BO-TAE when global shape perception was ambiguous due to contour manipulation.
Main Results:
- Significant BO-TAEs were observed even when a global shape was not explicitly defined.
- The results indicate that the BO signal is robust to the breaking of gestalt factors.
Conclusions:
- A contour-independent mechanism likely underlies border ownership (BO) coding.
- This finding advances our understanding of the neural basis of figure-ground segregation.
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