Representation of color, form, and their conjunction across the human ventral visual pathway

Taylor, JohnMark; Xu, Yaoda

doi:10.1016/j.neuroimage.2022.118941

Cited by 21 publications

(16 citation statements)

References 92 publications

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“…Note that this analysis requires a classifier to pick up on features that reflect differences between a group of two stimuli versus another two stimuli, but this does not mean that it is necessarily using features that are common within each group; instead, we expect that a classifier learns neural patterns associated with each of the four stimuli and can find a boundary that separates two stimuli from two others. This analysis is very similar to previous analyses on colour-form conjunctions (Taylor and Xu, 2022).…”

Section: Feature Conjunctionssupporting

confidence: 87%

Mapping the Dynamics of Visual Feature Coding: Insights into Perception and Integration

Grootswagers

Robinson

Shatek

et al. 2023

Preprint

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The basic computations performed in the human early visual cortex are the foundation for visual perception. While we know a lot about these computations from work in non-human animals, a key missing piece is how the coding of visual features relates to our perceptual experience. To investigate visual feature coding, interactions, and their relationship to human perception, we investigated neural responses and perceptual similarity judgements to a large set of visual stimuli that varied parametrically along four feature dimensions. We measured neural responses using electroencephalography (N=16) to 256 grating stimuli that varied in orientation, spatial frequency, contrast, and colour. We then mapped the response profiles of the neural coding of each visual feature and their interactions, and related these to independently obtained behavioural judgements of stimulus similarity. The results confirmed fundamental principles of feature coding in the visual system, such that all four features were processed simultaneously but differed in their dynamics, and there was distinctive conjunction coding for different combinations of features in the neural responses. Importantly, modelling of the behaviour revealed that every feature contributed to perceptual experience, despite the untargeted nature of the behavioural task. Further, the relationship between neural coding and behaviour was evident from initial processing stages, signifying that the fundamental features, not just their interactions, are crucial for perceptual experience. This study highlights the importance of understanding how feature coding progresses through the visual hierarchy and the relationship between different stages of processing and perception.

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Section: Feature Conjunctionssupporting

confidence: 87%

Mapping the Dynamics of Visual Feature Coding: Insights into Perception and Integration

Grootswagers

Robinson

Shatek

et al. 2023

Preprint

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“…In working with the NSD image set, one of the major challenges researchers face is isolating correlated image features to study their independent contributions to brain activity. Because our ROIs in the ventral visual pathway were known to be color biased, 11,12,14,18,36 we analyzed warmth and saturation in the NSD images. In order to isolate the effects of these image features independently from food, we created groups of food and non-food images where the histograms of these color image statistics were exactly matched (Figure S3A).…”

Section: Reliability and Consistency Of Results And Biases In The Nsd...mentioning

confidence: 99%

“…7,8 Color is an important feature of objects, 9,10 and color-biased regions have been found in the ventral visual pathway anterior to V4. [11][12][13][14][15][16][17][18][19] Are there supraordinate object specialisms associated with the color biases observed in these regions?…”

Section: Introductionmentioning

confidence: 99%

Color-biased regions in the ventral visual pathway are food selective

et al. 2023

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“…The lateral asymmetry in the response to the colors observed in Figure 9 appears consistent with the report by Bramao and colleagues [ 37 ] who suggested that the right V4 may carry more color processing than the left V4. Taylor and Xu [ 38 ] and Siuda-Krzywicka with co-workers [ 39 ] have recently reported somewhat similar observations, while the results of Singh and colleagues [ 40 ] may also be relevant.…”

Section: Discussionmentioning

confidence: 68%

An “Instantaneous” Response of a Human Visual System to Hue: An EEG-Based Study

Tcheslavski

Vasefi

2022

Sensors

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(1) The article presents a new technique to interpret biomedical data (EEG) to assess cortical responses to continuous color/hue variations. We propose an alternative approach to analyze EEG activity evoked by visual stimulation. This approach may augment the traditional VEP analysis. (2) Considering ensembles of EEG epochs as multidimensional spatial vectors evolving over time (rather than collections of time-domain signals) and evaluating the similarity between such vectors across different EEG epochs may result in a more accurate detection of colors that evoke greater responses of the visual system. To demonstrate its suitability, the developed analysis technique was applied to the EEG data that we previously collected from 19 participants with normal color vision, while exposing them to stimuli of continuously varying hue. (3) Orange/yellow and dark blue/violet colors generally aroused better-pronounced cortical responses. The selection of EEG channels allowed for assessing the activity that predominantly originates from specific cortical regions. With such channel selection, the strongest response to the hue was observed from Parieto-Temporal region of the right hemisphere. The statistical test—Kruskal–Wallis one-way analysis of variance—indicates that the distance evaluated for spatial EEG vectors at different post-stimulus latencies generally originate from different statistical distributions with a probability exceeding 99.9% (α = 0.001).

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Representation of color, form, and their conjunction across the human ventral visual pathway

Cited by 21 publications

References 92 publications

Mapping the Dynamics of Visual Feature Coding: Insights into Perception and Integration

Mapping the Dynamics of Visual Feature Coding: Insights into Perception and Integration

Color-biased regions in the ventral visual pathway are food selective

An “Instantaneous” Response of a Human Visual System to Hue: An EEG-Based Study

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