Colour constancy and conscious perception of changes of illuminant

Barbur, John L.; Spang, Karoline

doi:10.1016/j.neuropsychologia.2007.11.032

Cited by 49 publications

(33 citation statements)

References 40 publications

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“…In part, the visual system uses context to find a criterion to balance sensitivity and stability (Kawabe & Miura, 2006;Stonkute et al, 2012;Wexler et al, 2001). In part, it relies on prior knowledge about the physical plausibility (or implausibility) of a particular change that governs both detection Stonkute et al, 2012;Treue, Andersen, Ando, & Hildreth, 1995) and appearance (Barbur & Spang, 2008;Combe & Wexler, 2010;Suzuki & Grabowecky, 2002;Tse, 2006;Tse & Logothetis, 2002;Wexler et al, 2005) of transformations. Transformation priming appears to provide an additional mechanism for adjusting the criterion dynamically to the current visual environment on the basis of recent perceptual experience.…”

Section: Discussionmentioning

confidence: 99%

“…Because of that in examples above certain transformations are more likely to be perceived than other. Previous work of on transformation priors (Barbur & Spang, 2008;Combe & Wexler, 2010;Pastukhov, Vonau, & Braun, 2012;Tse, 2006;Tse & Logothetis, 2002;Wexler & van Boxtel, 2005) demonstrated their importance to the dynamic perception and their link to ecological constraints of the outside world. Present work extends this by asking the question whether this prior knowledge is gathered from the recent perceptual experience or can be considered to be static.…”

Section: Introductionmentioning

confidence: 99%

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Transformation priming helps to disambiguate sudden changes of sensory inputs

2015

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Retinal input is riddled with abrupt transients due to self-motion, changes in illumination, object-motion, etc. Our visual system must correctly interpret each of these changes to keep visual perception consistent and sensitive. This poses an enormous challenge, as many transients are highly ambiguous in that they are consistent with many alternative physical transformations. Here we investigated inter-trial effects in three situations with sudden and ambiguous transients, each presenting two alternative appearances (rotation-reversing structure-from-motion, polarity-reversing shape-from-shading, and streaming-bouncing object collisions). In every situation, we observed priming of transformations as the outcome perceived in earlier trials tended to repeat in subsequent trials and this repetition was contingent on perceptual experience. The observed priming was specific to transformations and did not originate in priming of perceptual states preceding a transient. Moreover, transformation priming was independent of attention and specific to low level stimulus attributes. In summary, we show how "transformation priors" and experience-driven updating of such priors helps to disambiguate sudden changes of sensory inputs. We discuss how dynamic transformation priors can be instantiated as "transition energies" in an "energy landscape" model of the visual perception.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transformation priming helps to disambiguate sudden changes of sensory inputs

2015

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“…V4 is active in passive color tasks (Howard et al, 1998;McKeefry & Zeki, 1997;Sakai et al, 1995). Both subregions contribute to color constancy operations (Barbur & Spang, 2008;Bartels & Zeki, 2000). In tasks demanding active color manipulation, it is mainly V4α that is involved (Beauchamp Beauchamp (2008) have identified color-specific neurons in V4α in one patient, using electrophysiological methods.…”

Section: Introductionmentioning

confidence: 99%

Color Specificity in the Human V4 Complex – An fMRI Repetition Suppression Study

Leeuwen¹,

Petersson

Langner³

et al. 2014

Advanced Brain Neuroimaging Topics in Health and Disease - Methods and Applications

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“…However, an understanding of these neural processes is incomplete without knowing how they jointly contribute to the perception or behavior of an organism. Psychophysical experiments can address this question by determining whether a given perceptual finding results from neural processing within monocular neural pathways, binocular neural pathways, or both (Barbur & Spang, 2008;D'Antona et al, 2011;D'Antona, Rosenberg, & Shevell, 2010;Flynn & Shapiro, 2013;Moutoussis & Zeki, 2000;Petrov & McKee, 2009;Shevell, Holliday, & Whittle, 1992;Shevell & Wei, 2000;Singer & D'Zmura, 1994;Webb, Dhruv, Solomon, Tailby, & Lennie, 2005). The goal of this approach is to determine the loci of the underlying neural mechanisms that contribute causally to perception.…”

Section: Introductionmentioning

confidence: 99%

Separating monocular and binocular neural mechanisms mediating chromatic contextual interactions

2014

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When seen in isolation, a light that varies in chromaticity over time is perceived to oscillate in color. Perception of that same time-varying light may be altered by a surrounding light that is also temporally varying in chromaticity. The neural mechanisms that mediate these contextual interactions are the focus of this article. Observers viewed a central test stimulus that varied in chromaticity over time within a larger surround that also varied in chromaticity at the same temporal frequency. Center and surround were presented either to the same eye (monocular condition) or to opposite eyes (dichoptic condition) at the same frequency (3.125, 6.25, or 9.375 Hz). Relative phase between center and surround modulation was varied. In both the monocular and dichoptic conditions, the perceived modulation depth of the central light depended on the relative phase of the surround. A simple model implementing a linear combination of center and surround modulation fit the measurements well. At the lowest temporal frequency (3.125 Hz), the surround's influence was virtually identical for monocular and dichoptic conditions, suggesting that at this frequency, the surround's influence is mediated primarily by a binocular neural mechanism. At higher frequencies, the surround's influence was greater for the monocular condition than for the dichoptic condition, and this difference increased with temporal frequency. Our findings show that two separate neural mechanisms mediate chromatic contextual interactions: one binocular and dominant at lower temporal frequencies and the other monocular and dominant at higher frequencies (6-10 Hz).

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Colour constancy and conscious perception of changes of illuminant

Cited by 49 publications

References 40 publications

Transformation priming helps to disambiguate sudden changes of sensory inputs

Transformation priming helps to disambiguate sudden changes of sensory inputs

Color Specificity in the Human V4 Complex – An fMRI Repetition Suppression Study

Separating monocular and binocular neural mechanisms mediating chromatic contextual interactions

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