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Adaptation for Discrimination

Explore how light reflection adaptation affects discrimination thresholds and appearance in visual perception. Investigate the underlying response function and linkage between threshold and appearance measurements. Studying response function changes in different contexts characterizes adaptation. This study examines how simple context changes influence adaptation mechanisms across various visual stimuli.

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Adaptation for Discrimination

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  1. Adaptation for Discrimination

  2. Light reflected = r * I Light reflected = r * I Adaptation for Discrimination

  3. Adaptation for Discrimination

  4. Adaptation for Discrimination

  5. Adaptation for Discrimination

  6. DIT1

  7. DIT1 DIT2

  8. Discrimination Thresholds

  9. DIT1 DIT2 Response Function Pedestal Contrast

  10. Discrimination Thresholds See Hillis and Brainard (2005; under review)

  11. Boynton et al., 1999

  12. Discrimination Thresholds See Hillis and Brainard (2005; under review)

  13. Discrimination Thresholds See Hillis and Brainard (2005; under review)

  14. Light reflected = r * I Light reflected = r * I Adaptation for Appearance

  15. Adaptation for Appearance

  16. Adaptation for Appearance

  17. Adaptation for Appearance

  18. See Hillis and Brainard (2005; under review)

  19. Discrimination Thresholds See Hillis and Brainard (2005; under review)

  20. Discrimination Thresholds See Hillis and Brainard (2005; under review)

  21. Thresholds & Appearance See Hillis and Brainard (2005; under review)

  22. See Hillis and Brainard (2005; under review)

  23. 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.]

  24. “PAINT” x x “SHADOW” x x (Adopted, with permission, from Adelson’s checkerboard illusion)

  25. “Shadow” “Paint”

  26. “Shadow” “Paint”

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