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• W2024682746 abstract "Segmenting the visual image into objects is a crucial stage of visual processing. Object boundaries are typically associated with differences in luminance, but discontinuities in texture also play an important role. We showed previously that a subpopulation of neurons in V2 in anesthetized macaques responds to orientation discontinuities parallel to their receptive field orientation. Such single-cell responses could be a neurophysiological correlate of texture boundary detection. Neurons in V1, on the other hand, are known to have contextual response modulations such as iso-orientation surround suppression, which also produce responses to orientation discontinuities. Here, we use pseudorandom multiregion grating stimuli of two frame durations (20 and 40 ms) to probe and compare texture boundary responses in V1 and V2 in anesthetized macaque monkeys. In V1, responses to texture boundaries were observed for only the 40 ms frame duration and were independent of the orientation of the texture boundary. However, in transient V2 neurons, responses to such texture boundaries were robust for both frame durations and were stronger for boundaries parallel to the neuron's preferred orientation. The dependence of these processes on stimulus duration and orientation indicates that responses to texture boundaries in V2 arise independently of contextual modulations in V1. In addition, because the responses in transient V2 neurons are sensitive to the orientation of the texture boundary but those of V1 neurons are not, we suggest that V2 responses are the correlate of texture boundary detection, whereas contextual modulation in V1 serves other purposes, possibly related to orientation pop-out." @default.
• W2024682746 created "2016-06-24" @default.
• W2024682746 creator A5042236120 @default.
• W2024682746 creator A5076389348 @default.
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• W2024682746 date "2014-03-05" @default.
• W2024682746 modified "2023-10-13" @default.
• W2024682746 title "Responses to Orientation Discontinuities in V1 and V2: Physiological Dissociations and Functional Implications" @default.
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• W2024682746 doi "https://doi.org/10.1523/jneurosci.2293-13.2014" @default.
• W2024682746 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3942574" @default.
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