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N400 effects of semantic richness can be modulated by task demands
Rocío A López Zunini1, Louis Renoult2, Vanessa Taler1
1School of Psychology, University of Ottawa.
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 2 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. (PsycINFO Database Record
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