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• W2051228590 startingPage "e54085" @default.
• W2051228590 abstract "Human observers tend to group oriented line segments into full contours if they follow the Gestalt rule of 'good continuation'. It is commonly assumed that contour grouping emerges automatically in early visual cortex. In contrast, recent work in animal models suggests that contour grouping requires learning and thus involves top-down control from higher brain structures. Here we explore mechanisms of top-down control in perceptual grouping by investigating synchronicity within EEG oscillations. Human participants saw two micro-Gabor arrays in a random order, with the task to indicate whether the first (S1) or the second stimulus (S2) contained a contour of collinearly aligned elements. Contour compared to non-contour S1 produced a larger posterior post-stimulus beta power (15-21 Hz). Contour S2 was associated with a pre-stimulus decrease in posterior alpha power (11-12 Hz) and in fronto-posterior theta (4-5 Hz) phase couplings, but not with a post-stimulus increase in beta power. The results indicate that subjects used prior knowledge from S1 processing for S2 contour grouping. Expanding previous work on theta oscillations, we propose that long-range theta synchrony shapes neural responses to perceptual groupings regulating lateral inhibition in early visual cortex." @default.
• W2051228590 created "2016-06-24" @default.
• W2051228590 creator A5026974096 @default.
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• W2051228590 date "2013-01-10" @default.
• W2051228590 modified "2023-10-02" @default.
• W2051228590 title "Top-Down Control in Contour Grouping" @default.
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• W2051228590 doi "https://doi.org/10.1371/journal.pone.0054085" @default.
• W2051228590 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3542329" @default.
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• W2051228590 hasPublicationYear "2013" @default.
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