N400 effects of semantic richness can be modulated by task demands

López Zunini, Rocío A., Renoult, Louis ORCID: https://orcid.org/0000-0001-7861-0552 and Taler, Vanessa (2017) N400 effects of semantic richness can be modulated by task demands. Neuropsychology, 31 (3). pp. 277-291. ISSN 0894-4105

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Abstract

Semantic richness is a multidimensional construct that can be defined as the amount of semantic information associated with a concept.Objective: to investigate neurophysiological correlates of semantic richness information associated with words and its interaction with task demands. Method: two different dimensions of semantic richness (number of associates and number of semantic neighbors) were investigated using Event-Related Potentials (ERPs) in lexical decision (LDT) and semantic categorization tasks (SCT) using the same stimuli in two groups of participants (24 in each group).Results: the amplitude of the N400 ERP component, which is associated with semantic processing, was smaller for words with a high number of associates (p=.003 at fronto-centro-parietal sites) or semantic neighbors (p<.03 at centro-parietal sites) than for words with a low number of associates or number of semantic neighbors, in the LDT but not the SCT.Conclusions: these results suggest that the effects of semantic richness vary with task demands and may be used in a top-down manner to accommodate the current context.

Item Type:	Article
Faculty \ School:	Faculty of Social Sciences > School of Psychology
UEA Research Groups:	Faculty of Social Sciences > Research Groups > Cognition, Action and Perception
Depositing User:	Pure Connector
Date Deposited:	24 Sep 2016 00:56
Last Modified:	22 Oct 2022 01:33
URI:	https://ueaeprints.uea.ac.uk/id/eprint/60307
DOI:	10.1037/neu0000327

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