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Attentional control of texture orientation judgments
Charles Chubb1, Jennifer Talevich
1Department of Cognitive Sciences, University of California at Irvine, Irvine, CA 92697-5100, USA. cfchubb@uci.edu
Vision Research
|January 26, 2002
Summary
This study shows that top-down attention significantly influences texture orientation judgments. Observers can selectively control their attention to process specific texture elements, demonstrating flexible cognitive control over visual perception.
Area of Science:
- Visual Perception
- Cognitive Neuroscience
- Computational Vision
Background:
- Texture processing models often assume bottom-up, preattentive computations.
- The influence of top-down factors on texture perception remains underexplored.
- Understanding attentional control in visual texture analysis is crucial.
Purpose of the Study:
- To investigate the susceptibility of texture orientation judgments to top-down attentional control.
- To determine the extent to which observers can modulate texture computations via attention.
Main Methods:
- Observers judged texture orientation based on line segment displays with varying luminance.
- Tasks involved matching intensity histograms of texture elements to target histograms.
- Selective attention was directed towards positive contrast, negative contrast, or both.
Main Results:
- Observer performance showed adaptive flexibility, indicating significant top-down control.
- Selective attention to specific contrast types (positive, negative, or high) improved performance.
- Performance correlated with the target histogram's approximation by weighted half-wave rectifiers.
Conclusions:
- Texture orientation judgments are highly susceptible to top-down attentional modulation.
- Attentional control appears to operate by adjusting the relative gain of on- and off-center systems.
- These findings challenge purely bottom-up models of texture processing.