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• W2748436136 abstract "Visual objects are recognized by their features. Whereas some features are based on simple components (i.e., local features, such as orientation of line segments), some features are based on the whole object (i.e., global features, such as an object having a hole in it). Over the past five decades, behavioral, physiological, anatomical and computational studies have established a general model of vision, which starts from extracting local features in the lower visual pathways followed by a feature integration process that extracts global features in the higher visual pathways. This local-to-global model is successful in providing a unified account for a vast sets of perception experiments, but it fails to account for a set of experiments showing human visual systems’ superior sensitivity to global features. Understanding the neural mechanisms underlying the ‘global-first’ process will offer critical insights into new models of vision. The goal of the present study was to establish a non-human primate model of rapid processing of global features for elucidating the neural mechanisms underlying differential processing of global and local features. Monkeys were trained to make a saccade to a target in the black background, which was different from the distractors (white circle) in color (e.g., red circle target), local features (e.g., white square target), a global feature (e.g., white ring with a hole target) or their combinations (e.g., red square target). Contrary to the predictions of the prevailing local-to-global model, we found that 1) detecting a distinction or a change in the global feature was faster than detecting a distinction or a change in color or local features; 2) detecting a distinction in color was facilitated by a distinction in the global feature, but not in the local features; and 3) detecting the hole was interfered by the local features of the hole (e.g., white ring with a squared hole). These results suggest that monkey ON visual systems have a subsystem that is more sensitive to distinctions in the global feature than local features. They also provide the behavioral constraints for identifying the underlying neural substrates." @default.
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• W2748436136 date "2017-08-25" @default.
• W2748436136 modified "2023-10-18" @default.
• W2748436136 title "Rapid Processing of a Global Feature in the ON Visual Pathways of Behaving Monkeys" @default.
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• W2748436136 doi "https://doi.org/10.3389/fnins.2017.00474" @default.
• W2748436136 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5575892" @default.
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