Accommodation to Uncomfortable Patterns

Haigh, Sarah M.; Jaschinski, Wolfgang; Allen, Peter M.; Wilkins, Arnold J.

doi:10.1068/p7397

Cited by 8 publications

(7 citation statements)

References 37 publications

(68 reference statements)

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“…19 Similarly, when the colors used in Parra and colleagues' 12 study were replotted in perceptual color space (CIE UCS), there was a linear increase in the likelihood of photoparoxysmal responses with increased chromaticity separation. 22 Together, this suggests that the sensitivity arises in cortex and not in the eye per se. For example, pink and purple have a smaller chromaticity separation than red and blue.…”

Section: Introductionmentioning

confidence: 99%

“…Larger chromaticity separations were rated as more uncomfortable to view by nonclinical populations, evoked larger hemodynamic responses, 21 and greater alpha suppression 20 in visual cortex, despite normal ocular accommodation. 22 Together, this suggests that the sensitivity arises in cortex and not in the eye per se. However, the relationship between discomfort and neural response to chromaticity separation was only linear when color difference was calculated in perceptual color space and not when calculated in terms of cone activation.…”

Section: Introductionmentioning

confidence: 99%

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Cortical Hyper‐Excitability in Migraine in Response to Chromatic Patterns

et al. 2019

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Objective Individuals with migraine exhibit heightened sensitivity to visual input that continues beyond their migraine episodes. However, the contribution of color to visual sensitivity, and how it relates to neural activity, has largely been unexplored in these individuals. Background Previously, it has been shown that, in non‐migraine individuals, patterns with greater chromaticity separation evoked greater cortical activity, regardless of hue, even when colors were isoluminant. Therefore, to investigate whether individuals with migraine experienced increased visual sensitivity, we compared the behavioral and neural responses to chromatic patterns of increasing separation in migraine and non‐migraine individuals. Methods Seventeen individuals with migraine (12 with aura) and 18 headache‐free controls viewed pairs of colored horizontal grating patterns that varied in chromaticity separation. Color pairs were either blue‐green, red‐green, or red‐blue. Participants rated the discomfort of the gratings and electroencephalogram was recorded simultaneously. Results Both groups showed increased discomfort ratings and larger N1/N2 event‐related potentials (ERPs) with greater chromaticity separation, which is consistent with increased cortical excitability. However, individuals with migraine rated gratings as being disproportionately uncomfortable and exhibited greater effects of chromaticity separation in ERP amplitude across occipital and parietal electrodes. Ratings of discomfort and ERPs were smaller in response to the blue‐green color pairs than the red‐green and red‐blue gratings, but this was to an equivalent degree across the 2 groups. Conclusions Together, these findings indicate that greater chromaticity separation increases neural excitation, and that this effect is heightened in migraine, consistent with the theory that hyper‐excitability of the visual system is a key signature of migraine.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cortical Hyper‐Excitability in Migraine in Response to Chromatic Patterns

et al. 2019

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“…Over a large gamut of chromaticity, increasing chromaticity difference consistently increases discomfort (Haigh et al, 2012(Haigh et al, , 2013aLindquist et al, 2021), and evokes a large hemodynamic (Haigh et al, 2013a(Haigh et al, , 2015 and electrophysiological response (Haigh et al, 2015(Haigh et al, , 2019Lindquist et al, 2021). The effect is not attributable to any influence of chromatic aberration on accommodation (Haigh et al, 2013b).…”

Section: Introductionmentioning

confidence: 85%

Visual Discomfort and Variations in Chromaticity in Art and Nature

et al. 2021

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Visual discomfort is related to the statistical regularity of visual images. The contribution of luminance contrast to visual discomfort is well understood and can be framed in terms of a theory of efficient coding of natural stimuli, and linked to metabolic demand. While color is important in our interaction with nature, the effect of color on visual discomfort has received less attention. In this study, we build on the established association between visual discomfort and differences in chromaticity across space. We average the local differences in chromaticity in an image and show that this average is a good predictor of visual discomfort from the image. It accounts for part of the variance left unexplained by variations in luminance. We show that the local chromaticity difference in uncomfortable stimuli is high compared to that typical in natural scenes, except in particular infrequent conditions such as the arrangement of colorful fruits against foliage. Overall, our study discloses a new link between visual ecology and discomfort whereby discomfort arises when adaptive perceptual mechanisms are overstimulated by specific classes of stimuli rarely found in nature.

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“…With simple patterns of alternating coloured stripes, both the discomfort from the pattern and the size of the cortical response it evokes can be predicted. The discomfort is predictable not from the particular colours involved as much as from the difference between their CIE UCS 1976 chromaticities: [22][23][24][25] the greater the difference, the greater the discomfort and the greater the cortical response. 22,24 Penacchio et al 2 have shown that the same considerations apply to more complex images such as contemporary non-representational works of art.…”

Section: Colour Contrastmentioning

confidence: 99%