Adaptation and Discrimination: Understanding the Response Function in Visual Perception
This study explores the relationship between adaptation, discrimination thresholds, and visual perception. It focuses on how light intensity and context influence the ability to discriminate against backgrounds. Referring to previous work by Hillis and Brainard (2005), the research examines both threshold and appearance measurements, suggesting that these can be linked to a common response function. Significant findings indicate that simple changes in viewing context affect adaptation mechanisms, although this may not hold true universally.
Adaptation and Discrimination: Understanding the Response Function in Visual Perception
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Presentation Transcript
Light reflected = r * I Light reflected = r * I Adaptation for Discrimination
DIT1 DIT2
DIT1 DIT2 Response Function Pedestal Contrast
Discrimination Thresholds See Hillis and Brainard (2005; under review)
Discrimination Thresholds See Hillis and Brainard (2005; under review)
Discrimination Thresholds See Hillis and Brainard (2005; under review)
Light reflected = r * I Light reflected = r * I Adaptation for Appearance
Discrimination Thresholds See Hillis and Brainard (2005; under review)
Discrimination Thresholds See Hillis and Brainard (2005; under review)
Thresholds & Appearance See Hillis and Brainard (2005; under review)
Summary • Both threshold and appearance measurements can be linked (by hypothesis) to an underlying response function. • Studying change in response function with viewing context is one way to characterize adaptation. • For simple context changes (intensity of uniform backgrounds, unstructured contrast), both threshold and appearance data are consistent with a common mechanism of adaptation. [This is not true in general.]
“PAINT” x x “SHADOW” x x (Adopted, with permission, from Adelson’s checkerboard illusion)
“Shadow” “Paint”
“Shadow” “Paint”
