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Disentangling stimulus plausibility and contextual congruency: Electro-physiological evidence for differential cognitive dynamics
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Orientador(es)
Resumo(s)
Expectancy mechanisms are routinely used by the cognitive system in stimulus processing and in anticipation of
appropriate responses. Electrophysiology research has documented negative shifts of brain activity when
expectancies are violated within a local stimulus context (e.g., reading an implausible word in a sentence) or
more globally between consecutive stimuli (e.g., a narrative of images with an incongruent end). In this EEG
study, we examine the interaction between expectancies operating at the level of stimulus plausibility and at
more global level of contextual congruency to provide evidence for, or against, a disassociation of the underlying
processing mechanisms. We asked participants to verify the congruency of pairs of cross-modal stimuli (a
sentence and a scene), which varied in plausibility. ANOVAs on ERP amplitudes in selected windows of interest
show that congruency violation has longer-lasting (from 100 to 500 ms) and more widespread effects than
plausibility violation (from 200 to 400 ms). We also observed critical interactions between these factors,
whereby incongruent and implausible pairs elicited stronger negative shifts than their congruent counterpart,
both early on (100–200 ms) and between 400–500 ms. Our results suggest that the integration mechanisms are
sensitive to both global and local effects of expectancy in a modality independent manner. Overall, we provide
novel insights into the interdependence of expectancy during meaning integration of cross-modal stimuli in a
verification task.
Descrição
Palavras-chave
Semantic processing EEG Event plausibility Electro-physiology Stimulus processing
Contexto Educativo
Citação
Coco, M. I., Araújo, S., & Petersson, K. M. (2017). Disentangling stimulus plausibility and contextual congruency: Electro-physiological evidence for differential cognitive dynamics. Neuropsychologia, 96, 150-163. https://doi.org/10.1016/j.neuropsychologia.2016.12.008
Editora
Elsevier