Beyond category-based object characterization.

Nat Neurosci

Nature Neuroscience, .

Published: October 2024

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http://dx.doi.org/10.1038/s41593-024-01781-6DOI Listing

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A dissociation between the effects of expectations and attention in selective visual processing.

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Department of Psychological Sciences, Birkbeck College, University of London, Malet Street, London WC1E 7HX, United Kingdom.

It is often claimed that probabilistic expectations affect visual perception directly, without mediation by selective attention. However, these claims have been disputed, as effects of expectation and attention are notoriously hard to dissociate experimentally. In this study, we used a new approach to separate expectations from attention.

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Visual periodicity reveals distinct attentional signatures for face and non-face categories.

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Unité de Recherche en Neurosciences Cognitives (UNESCOG), ULB Neuroscience Institue (UNI), Center for Research in Cognition & Neurosciences (CRCN), Université libre de Bruxelles (ULB), Avenue Franklin Roosevelt, 50-CP191, 1050 Brussels, Belgium.

Observers can selectively deploy attention to regions of space, moments in time, specific visual features, individual objects, and even specific high-level categories-for example, when keeping an eye out for dogs while jogging. Here, we exploited visual periodicity to examine how category-based attention differentially modulates selective neural processing of face and non-face categories. We combined electroencephalography with a novel frequency-tagging paradigm capable of capturing selective neural responses for multiple visual categories contained within the same rapid image stream (faces/birds in Exp 1; houses/birds in Exp 2).

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Category-based attention facilitates memory search.

eNeuro

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Donders Institute for Brain, Cognition and Behaviour, Radboud University, 6525 GD Nijmegen, The Netherlands

We often need to decide whether the object we look at is also the object we look for. When we look for one specific object, this process can be facilitated by feature-based attention. However, when we look for many objects at the same time (e.

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