“Tilt” in color space: Hue changes induced by chromatic surrounds

Klauke, Susanne; Wachtler, Thomas

doi:10.1167/15.13.17

Cited by 32 publications

(73 citation statements)

References 62 publications

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“…As for motion induction, only a repulsive tilt effect is observed with hue. The model's ability to account for these data is evident from Figure 4B, which confirms the hypothesis by Klauke and Wachtler (2015) that color induction is in fact just another tilt effect (i.e., a "hue tilt effect"). Furthermore, the same mechanisms that are responsible for the tilt effect in the orientation and motion domains, namely the balance between facilitatory and suppressive forces originating from the eCRF, are also at play in color induction ( Figure 4A).…”

Section: Dsupporting

confidence: 79%

“…Colored patches shown next to the eyes correspond to the color decoded under the ideal observer. B. Psychophysics vs. model data: Psychophysics data were digitally extracted from Figure 2 in (Klauke and Wachtler, 2015) and fitted with splines (averaged across eight surround hues). Both model and behavioral data exhibit a characteristic two-lobed shape peaking around ±50 o .…”

Section: Dmentioning

confidence: 99%

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Opponent surrounds explain diversity of contextual phenomena across visual modalities

Mély

Serre

2016

Preprint

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AsbtractContext is known to affect how a stimulus is perceived. A variety of illusions have been attributed to contextual processing -from orientation tilt effects to chromatic induction phenomena, but their neural underpinnings remain poorly understood. Here, we present a recurrent network model of classical and extra-classical receptive fields that is constrained by the anatomy and physiology of the visual cortex. A key feature of the model is the postulated existence of two spatially disjoint near-vs. far-extra-classical regions with complementary facilitatory and suppressive contributions to the classical receptive field. The model accounts for a variety of contextual illusions, reveals commonalities between seemingly disparate phenomena, and helps organize them into a novel taxonomy. It explains how center-surround interactions may shift from attraction to repulsion in tilt effects, and from contrast to assimilation in induction phenomena.The model further explains enhanced perceptual shifts generated by a class of patterned background stimuli that activate the two opponent extra-classical regions cooperatively. Overall, the ability of the model to account for the variety and complexity of contextual illusions provides computational evidence for a novel canonical circuit that is shared across visual modalities.

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Section: Dsupporting

confidence: 79%

Section: Dmentioning

confidence: 99%

Opponent surrounds explain diversity of contextual phenomena across visual modalities

Mély

Serre

2016

Preprint

View full text Add to dashboard Cite

show abstract

“…26 holds. Different is the case where the target and test stimuli are presented against a chromatic background, where subjects have been reported to bias their estimation of the target stimulus away from the hue of the background (see for example Klaue and Wachtler 2015). In such cases, we suspect that the more complex form of the Cramér-Rao bound should be employed.…”

Section: Discussionmentioning

confidence: 99%

Derivation of Human Chromatic Discrimination Ability from an Information-Theoretical Notion of Distance in Color Space

Fonseca

Samengo

2016

Neural Computation

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The accuracy with which humans can detect small chromatic differences varies throughout color space. For example, we are far more precise when discriminating two similar orange stimuli than two similar green stimuli. In order for two colors to be perceived as different, the neurons representing chromatic information must respond differently, and the difference must be larger than the trial-to-trial variability of the response to each separate color. Photoreceptors constitute the first stage in the processing of color information; many more stages are required before humans can consciously report whether two stimuli are perceived as chromatically distinguishable or not. Therefore, although photoreceptor absorption curves are expected to influence the accuracy of conscious discriminability, there is no reason to believe that they should suffice to explain it. Here we develop informationtheoretical tools based on the Fisher metric that demonstrate that photoreceptor absorption properties explain ≈ 87% of the variance of human color discrimination ability, as tested by previous behavioral experiments. In the context of this theory, the bottleneck in chromatic information processing is determined by photoreceptor absorption characteristics. Subsequent encoding stages modify only marginally the chromatic discriminability at the photoreceptor level.

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“…This is not to say, of course, that contextual modulations for colour are never repulsive. In the fovea, the perceived hue of targets can be repulsed from the surround (38), though similar contextual effects tend towards assimilation in the periphery (39). This is similar to orientation, where repulsion dominates near the fovea, giving way to assimilation in the periphery (9).…”

Section: Discussionmentioning

confidence: 94%

Dissociable effects of visual crowding on the perception of colour and motion

Greenwood

Parsons

2019

Preprint

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Our ability to recognise objects in peripheral vision is fundamentally limited by crowding, the deleterious effect of clutter that disrupts the recognition of features ranging from orientation and colour to motion and depth. Prior research is equivocal on whether this reflects a singular process that disrupts all features simultaneously or multiple processes that affect each independently. We examined crowding for motion and colour, two features that allow a strong test of feature independence. 'Cowhide' stimuli were presented 15 degrees in peripheral vision, either in isolation or surrounded by flankers to give crowding. Observers reported either the target hue (blue/purple) or its direction (clockwise/counterclockwise from upwards). We first established that both features show systematic crowded errors (predominantly biased towards the flanker identities) and selectivity for target-flanker similarity (with reduced crowding for dissimilar target/flanker elements). The multiplicity of crowding was then tested with observers identifying both features: a singular object-selective mechanism predicts that when crowding is weak for one feature and strong for the other that crowding should be all-or-none for both. In contrast, when crowding was weak for colour and strong for motion, errors were reduced for colour but remained for motion, and vice versa with weak motion and strong colour crowding. This double dissociation follows the predictions of independent crowding processes, suggesting that crowding can disrupt vision in a feature-specific manner. The ability to recognise one aspect of a cluttered scene, like colour, thus offers no guarantees for the correct recognition of other aspects, like motion. Significance statementThe fundamental limitation on our peripheral vision is crowding, the disruptive effect of image clutter on object recognition. Crowding is widely assumed to be a singular process, affecting all of the features (e.g. orientation, motion, and colour) within an object simultaneously. In contrast, we find a double dissociation for these disruptions: observers can make errors in judging the colour of a crowded object whilst correctly judging its movement direction, and vice versa. This dissociation is well described by a population-coding model that independently pools the motion and colour of target and flanker elements. We suggest that crowding may be a generic set of processes distributed throughout the visual system that independently simplify the representation of our visual field.

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“Tilt” in color space: Hue changes induced by chromatic surrounds

Cited by 32 publications

References 62 publications

Opponent surrounds explain diversity of contextual phenomena across visual modalities

Opponent surrounds explain diversity of contextual phenomena across visual modalities

Derivation of Human Chromatic Discrimination Ability from an Information-Theoretical Notion of Distance in Color Space

Dissociable effects of visual crowding on the perception of colour and motion

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