Plasticity in perception: insights from color vision deficiencies

Isherwood, Zoey J.; Joyce, Daniel S.; Parthasarathy, Mohana Kuppuswamy; Webster, Michael A.

doi:10.12703/b/9-8

Cited by 18 publications

(10 citation statements)

References 129 publications

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“…In turn, it is clear that perception and performance for many visual tasks remains compromised for most anomalous trichromats, and even when there is clear evidence for compensation it is typically not complete [21]. Understanding what factors act to mitigate full compensation might help elucidate fundamental neural constraints on sensory plasticity [16].…”

Section: Discussionmentioning

confidence: 99%

“…Yet despite this theoretical importance, whether and how color compensation occurs in anomalous trichromacy remains poorly understood (for review see [13] and [16]. The tasks indicating compensation tend to involve judging the similarity or size or salience of color differences [17-19], and thus could potentially reflect conceptual rather than perceptual adaptations.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Color compensation in anomalous trichromats assessed with fMRI

Tregillus

Isherwood

Vanston

et al. 2020

Preprint

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Anomalous trichromacy is a common form of congenital color-deficiency resulting from a genetic alteration in the photopigments of the eye's light receptors. The changes reduce sensitivity to reddish-greenish hues, yet previous work suggests that these observers may experience the world to be more colorful than their altered receptor sensitivities would predict, potentially indicating an amplification of post-receptoral signals. However, past evidence suggesting such a gain adjustment rests on subjective measures of color appearance or salience. We directly tested for neural amplification by using fMRI to measure cortical responses in color-anomalous and normal control observers. Color contrast response functions were measured in two experiments with different tasks to control for attentional factors. Both experiments showed a predictable reduction in chromatic responses for anomalous trichromats in primary visual cortex. However, in later areas V2v and V3v, chromatic responses in the two groups were indistinguishable. Our results provide direct evidence for neural plasticity that compensates for the deficiency in the initial receptor color signals and suggest that the site of this compensation is in early visual cortex.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Color compensation in anomalous trichromats assessed with fMRI

Tregillus

Isherwood

Vanston

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…For example, color appearance remains similar among old and young adults despite the large age‐related changes in spectral sensitivity, 9,10,33 and changes less across the visual field than predicted by changes in macular pigment screening 7,34,35 . Moreover, recent work suggests that even in individuals with color deficiencies, color percepts are more like those of color‐normal individuals than would be predicted based on their cone fundamentals 36,37 …”

Section: Adaptive Phenomena In Human Color Visionmentioning

confidence: 99%

Color appearance model incorporating contrast adaptation—Implications for individual differences in color vision

Smet¹,

Webster

Whitehead

2021

Color Research & Application

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Color appearance models are usually based on equations with fixed numerical coefficients that were predetermined to yield optimal agreement for a selected standard observer. Here we address the well‐known fact that, among color‐normal observers, there are significant differences of cone fundamentals, which often cause observer metamerism. This is not fully addressed by many appearance models. It might seem that observer metamerism could be accurately predicted by substituting an individual's color matching functions into an otherwise‐unchanged color appearance model, but this is not assured because the model's coefficients were not designed for the new observer. Here we explore a solution related to how the visual system tends to compensate for changes in color information arising from variations cone fundamentals. For this purpose, we developed a simple color appearance model that uses only a few numerical coefficients, yet accurately predicts the perceptual attributes of Munsell samples under a selected standard lighting condition. We then added a feedback loop to adjust the model coefficients automatically, in response to switching between the cone fundamentals for different observers. This feature is intended to model long term contrast adaptation in the vision system by maintaining the average long‐term levels of color contrast. Incorporating this adaptation principle into color appearance models could allow better assessments of displays and illumination systems, to help improve color appearances for most observers.

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“…Human colour vision exhibits significant diversities beyond the classifications used in this study, including variations in genetic factors [16,18,66,[71][72][73][74]. Little is known regarding the plasticity and compensation mechanisms involved in post-receptoral processes [22,62,75]. Exploring these unknowns and examining how the diversity of colour vision affects attention, impressions and emotions will provide a better understanding of the actual effects of diversity on behaviour and subjectivity.…”

Section: Discussionmentioning

confidence: 99%

Influence of colour vision on attention to, and impression of, complex aesthetic images

Hiramatsu,

Takashima,

Sakaguchi

et al. 2023

Proc. R. Soc. B.

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Humans exhibit colour vision variations due to genetic polymorphisms, with trichromacy being the most common, while some people are classified as dichromats. Whether genetic differences in colour vision affect the way of viewing complex images remains unknown. Here, we investigated how people with different colour vision focused their gaze on aesthetic paintings by eye-tracking while freely viewing digital rendering of paintings and assessed individual impressions through a decomposition analysis of adjective ratings for the images. Gaze-concentrated areas among trichromats were more highly correlated than those among dichromats. However, compared with the brief dichromatic experience with the simulated images, there was little effect of innate colour vision differences on impressions. These results indicate that chromatic information is instructive as a cue for guiding attention, whereas the impression of each person is generated according to their own sensory experience and normalized through one's own colour space.

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Plasticity in perception: insights from color vision deficiencies

Cited by 18 publications

References 129 publications

Color compensation in anomalous trichromats assessed with fMRI

Color compensation in anomalous trichromats assessed with fMRI

Color appearance model incorporating contrast adaptation—Implications for individual differences in color vision

Influence of colour vision on attention to, and impression of, complex aesthetic images

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