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Prior object-knowledge sharpens properties of early visual feature-detectors

Teufel, Christoph, Dakin, Steven C. and Fletcher, Paul C. 2018. Prior object-knowledge sharpens properties of early visual feature-detectors. Scientific Reports 8 , 10853. 10.1038/s41598-018-28845-5

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Abstract

Early stages of visual processing are carried out by neural circuits activated by simple and specific features, such as the orientation of an edge. A fundamental question in human vision is how the brain organises such intrinsically local information into meaningful properties of objects. Classic models of visual processing emphasise a one-directional flow of information from early feature-detectors to higher-level information-processing. By contrast to this view, and in line with predictive-coding models of perception, here, we provide evidence from human vision that high-level object representations dynamically interact with the earliest stages of cortical visual processing. In two experiments, we used ambiguous stimuli that, depending on the observer’s prior object-knowledge, can be perceived as either coherent objects or as a collection of meaningless patches. By manipulating object knowledge we were able to determine its impact on processing of low-level features while keeping sensory stimulation identical. Both studies demonstrate that perception of local features is facilitated in a manner consistent with an observer’s high-level object representation (i.e., with no effect on object-inconsistent features). Our results cannot be ascribed to attentional influences. Rather, they suggest that high-level object representations interact with and sharpen early feature-detectors, optimising their performance for the current perceptual context.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff University Brain Research Imaging Centre (CUBRIC)
Psychology
Publisher: Nature Publishing Group
ISSN: 2045-2322
Date of First Compliant Deposit: 13 June 2018
Date of Acceptance: 13 June 2018
Last Modified: 05 Mar 2019 10:11
URI: http://orca.cf.ac.uk/id/eprint/112241

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