1. Can computational goals inform theories of vision?

    Topics In Cognitive Science 7(2):274 (2015) PMID 25772207

    One of the most lasting contributions of Marr's posthumous book is his articulation of the different "levels of analysis" that are needed to understand vision. Although a variety of work has examined how these different levels are related, there is comparatively little examination of the assumpt...
  2. The role of chromatic variance in modulating color appearance.

    Journal of Vision 15(5):19 (2015) PMID 26067537

    Chromatictarget patches embedded in a chromatically variegated surround appear less saturated than when they are embedded in an achromatic uniform surround (Brown & MacLeod, 1997), which can be construed as either a form of gamut expansion for targets on uniform surrounds or as a form of gamut c...
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  3. Specular image structure modulates the perception of three-dimensional shape.

    Current Biology 24(22):2737 (2014) PMID 25455034

    Retinal images are produced by interactions between a surface's 3D shape, material properties, and surrounding light field. In order to recover the 3D geometry of a surface, the visual system must somehow separate aspects of image structure generated by a surface's shape from structure generated...
  4. Specular image structure modulates the perception of three-dimensional shape.

    Current Biology 24(22):2737 (2014) PMID 25455034

    Retinal images are produced by interactions between a surface's 3D shape, material properties, and surrounding light field. In order to recover the 3D geometry of a surface, the visual system must somehow separate aspects of image structure generated by a surface's shape from structure generated...
  5. Amodal completion is modulated by lightness similarity.

    Attention, Perception & Psychophysics 76(1):98 (2014) PMID 24043564

    The strength of amodal completion is known to be modulated by contour relationships and global shape. Some researchers have shown that amodal completion also depends on surface similarity, but they have not distinguished the relative importance of similarity in surface representations either pre...
  6. Lightness, brightness, and anchoring.

    Journal of Vision 14(9) (2014) PMID 25104828

    The majority of work in lightness perception has evaluated the perception of lightness using flat, matte, two-dimensional surfaces. In such contexts, the amount of light reaching the eye contains a conflated mixture of the illuminant and surface lightness. A fundamental puzzle of lightness perce...
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  7. Amodal completion is modulated by lightness similarity.

    Attention, Perception & Psychophysics 76(1):98 (2014) PMID 24043564

    The strength of amodal completion is known to be modulated by contour relationships and global shape. Some researchers have shown that amodal completion also depends on surface similarity, but they have not distinguished the relative importance of similarity in surface representations either pre...
  8. Texture-shading flow interactions and perceived reflectance.

    Journal of Vision 14(7) (2014) PMID 24891438

    The appearance of surface texture depends on the identification of edge contours in an image generated by local variations in reflectance. These edges in the image need to be distinguished from diffuse shading gradients caused by the interaction of light with surface relief. To understand how th...
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  9. Filling-in the gaps in models of completion.

    Cognitive Neuroscience 4(1):48 (2013) PMID 24073700

    Kogo and Wagemans' appropriately link completion phenomena to figure-ground computations. I argue that this link can be strengthened by considering the ecological conditions that give rise to completion phenomena. However, despite their polemics, the model that they offer can be viewed as an ela...
  10. Filling-in the gaps in models of completion.

    Cognitive Neuroscience 4(1):48 (2013) PMID 24073700

    Kogo and Wagemans' appropriately link completion phenomena to figure-ground computations. I argue that this link can be strengthened by considering the ecological conditions that give rise to completion phenomena. However, despite their polemics, the model that they offer can be viewed as an ela...
  11. The dark side of gloss.

    Nature Neuroscience 15(11):1590 (2012) PMID 23001059

    Our visual system relies on the image structure generated by the interaction of light with objects to infer their material properties. One widely studied surface property is gloss, which can provide information that an object is smooth, shiny or wet. Studies have historically focused on the role...
  12. The dark side of gloss.

    Nature Neuroscience 15(11):1590 (2012) PMID 23001059

    Our visual system relies on the image structure generated by the interaction of light with objects to infer their material properties. One widely studied surface property is gloss, which can provide information that an object is smooth, shiny or wet. Studies have historically focused on the role...
  13. The Perception and Misperception of Specular Surface Reflectance

    Current Biology 22(20):1909 (2012)

    The amount and spectral content of the light reflected by most natural surfaces depends on the structure of the light field, the observer’s viewing position, and 3D surface geometry, particularly for specular (glossy) surfaces. A growing body of data has demonstrated that perceived sur...
  14. The perception and misperception of specular surface reflectance.

    Current Biology 22(20):1909 (2012) PMID 22959347

    The amount and spectral content of the light reflected by most natural surfaces depends on the structure of the light field, the observer's viewing position, and 3D surface geometry, particularly for specular (glossy) surfaces. A growing body of data has demonstrated that perceived surface gloss...
  15. Psychology. Bird-brained illusionists.

    Science 335(6066):292 (2012) PMID 22267798

  16. Psychology. Bird-brained illusionists.

    Science 335(6066):292 (2012) PMID 22267798

  17. The role of amodal surface completion in stereoscopic transparency.

    Frontiers in Psychology 3:351 (2012) PMID 23060829 PMCID PMC3443795

    Previous work has shown that the visual system can decompose stereoscopic textures into percepts of inhomogeneous transparency. We investigate whether this form of layered image decomposition is shaped by constraints on amodal surface completion. We report a series of experiments that demonstrat...
  18. The role of amodal surface completion in stereoscopic transparency.

    Frontiers in Psychology 3:351 (2012) PMID 23060829 PMCID PMC3443795

    Previous work has shown that the visual system can decompose stereoscopic textures into percepts of inhomogeneous transparency. We investigate whether this form of layered image decomposition is shaped by constraints on amodal surface completion. We report a series of experiments that demonstrat...
  19. The role of amodal surface completion in stereoscopic transparency.

    Frontiers in Psychology 3:351 (2012) PMID 23060829 PMCID PMC3443795

    Previous work has shown that the visual system can decompose stereoscopic textures into percepts of inhomogeneous transparency. We investigate whether this form of layered image decomposition is shaped by constraints on amodal surface completion. We report a series of experiments that demonstrat...
  20. Visual perception of materials and surfaces.

    Current Biology 21(24):R978 (2011) PMID 22192826