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Semantic object processing is modulated by prior scene context


Type

Preprint

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Authors

Krugliak, Alexandra  ORCID logo  https://orcid.org/0000-0002-5031-3801
Võ, Melissa L-H 

Abstract

Objects that are congruent with a scene are recognised more efficiently than objects that are incongruent. Further, semantic integration of incongruent objects elicits a stronger N300/N400 EEG component. Yet, the time course and mechanisms of how contextual information supports access to semantic object information is unclear. We used computational modelling and EEG to test how context influences semantic object processing. Using representational similarity analysis, we established that EEG patterns dissociated between objects in congruent or incongruent scenes from around 300 ms. By modelling semantic processing of objects using independently normed properties, we confirm that the onset of semantic processing of both congruent and incongruent objects is similar (∼150 ms). Critically, after ∼275 ms, we discover a difference in the duration of semantic integration, lasting longer for incongruent compared to congruent objects. These results constrain our understanding of how contextual information supports access to semantic object information.

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Keywords

5202 Biological Psychology, 5204 Cognitive and Computational Psychology, 52 Psychology, Neurosciences, Neurological

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Sponsorship
Wellcome Trust (211200/Z/18/Z)