Adaptation for Discrimination
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Transcript of Adaptation for Discrimination
![Page 1: Adaptation for Discrimination](https://reader035.fdocuments.us/reader035/viewer/2022062718/56812bd7550346895d9044df/html5/thumbnails/1.jpg)
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Adaptation for Discrimination
![Page 5: Adaptation for Discrimination](https://reader035.fdocuments.us/reader035/viewer/2022062718/56812bd7550346895d9044df/html5/thumbnails/5.jpg)
Light reflected = r * I Light reflected = r * I
Adaptation for Discrimination
![Page 6: Adaptation for Discrimination](https://reader035.fdocuments.us/reader035/viewer/2022062718/56812bd7550346895d9044df/html5/thumbnails/6.jpg)
Adaptation for Discrimination
![Page 7: Adaptation for Discrimination](https://reader035.fdocuments.us/reader035/viewer/2022062718/56812bd7550346895d9044df/html5/thumbnails/7.jpg)
Adaptation for Discrimination
![Page 8: Adaptation for Discrimination](https://reader035.fdocuments.us/reader035/viewer/2022062718/56812bd7550346895d9044df/html5/thumbnails/8.jpg)
Adaptation for Discrimination
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IT1
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IT1
IT2
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Discrimination Thresholds
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Pedestal Contrast
Response Function
IT1
IT2
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Discrimination Thresholds
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Boynton et al., 1999
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Discrimination Thresholds
![Page 28: Adaptation for Discrimination](https://reader035.fdocuments.us/reader035/viewer/2022062718/56812bd7550346895d9044df/html5/thumbnails/28.jpg)
Discrimination Thresholds
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Light reflected = r * I Light reflected = r * I
Adaptation for Appearance
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Adaptation for Appearance
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Adaptation for Appearance
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Adaptation for Appearance
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See Hillis and Brainard (2005; under review)
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Discrimination Thresholds
See Hillis and Brainard (2005; under review)
![Page 40: Adaptation for Discrimination](https://reader035.fdocuments.us/reader035/viewer/2022062718/56812bd7550346895d9044df/html5/thumbnails/40.jpg)
Discrimination Thresholds
See Hillis and Brainard (2005; under review)
![Page 41: Adaptation for Discrimination](https://reader035.fdocuments.us/reader035/viewer/2022062718/56812bd7550346895d9044df/html5/thumbnails/41.jpg)
Thresholds & Appearance
See Hillis and Brainard (2005; under review)
![Page 42: Adaptation for Discrimination](https://reader035.fdocuments.us/reader035/viewer/2022062718/56812bd7550346895d9044df/html5/thumbnails/42.jpg)
See Hillis and Brainard (2005; under review)
![Page 43: Adaptation for Discrimination](https://reader035.fdocuments.us/reader035/viewer/2022062718/56812bd7550346895d9044df/html5/thumbnails/43.jpg)
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.]
![Page 44: Adaptation for Discrimination](https://reader035.fdocuments.us/reader035/viewer/2022062718/56812bd7550346895d9044df/html5/thumbnails/44.jpg)
“PAINT”
x x
“SHADOW”
x x
(Adopted, with permission, from Adelson’s checkerboard illusion)
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“Paint”
“Shadow”
![Page 46: Adaptation for Discrimination](https://reader035.fdocuments.us/reader035/viewer/2022062718/56812bd7550346895d9044df/html5/thumbnails/46.jpg)
“Paint”
“Shadow”