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Surround Suppression of Broadband Images. | LitMetric

AI Article Synopsis

  • - Visual perception is influenced by context, specifically through the phenomenon known as surround suppression, where stimulation outside a neuron's main receptive field reduces its firing rate.
  • - Recent research investigated how surround suppression functions with both naturalistic textures and traditional sinusoidal grating stimuli, finding that while surround suppression exists in both cases, it is stronger with sinusoidal patterns.
  • - The study highlighted differences in suppression effects among various broadband textures, showing that textures with a clear orientation led to stronger suppression than those with more mixed orientations, indicating that contextual effects may not fully apply to realistic visual experiences.

Article Abstract

Visual perception is profoundly sensitive to context. Surround suppression is a well-known visual context effect in which the firing rate of a neuron is suppressed by stimulation of its extra-classical receptive field. The majority of contrast surround suppression studies exclusively use narrowband, sinusoidal grating stimuli; however, it is unclear whether the results produced by such artificial stimuli generalize to real-world, naturalistic visual experiences. To address this issue, we developed a contrast discrimination paradigm that includes both naturalistic broadband textures and narrowband grating textures. All textures were matched for first order image statistics and overall perceptual salience. We observed surround suppression across broadband textures (F(1,6)=19.01, p=.005); however, effect sizes were largest for narrowband, sinusoidal gratings (Cohen's d=1.83). Among the three broadband texture types, we observed strongest suppression for the texture with a clear dominant orientation (stratified: Cohen's d=1.29), while the textures with a more even distribution of orientation information produced weaker suppression (fibrous: Cohen's d=0.63; braided: Cohen's d=0.65). We also observed an effect of texture identity on the slope of psychometric functions (F(1.98,11.9)=7.29, p=0.01), primarily driven by smaller slopes for the texture with the most uniform distribution of orientations. Our results suggest that well-known contextual modulation effects only partially generalize to more ecologically valid stimuli.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11118481PMC
http://dx.doi.org/10.1101/2024.05.15.594329DOI Listing

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