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Repeated Exposure to "meaningless" Pseudowords Modulates LPC, but Not N(FN)400

dc.contributor.authorBermúdez Margaretto, Beatriz 
dc.contributor.authorBeltrán, David
dc.contributor.authorDomínguez, Alberto
dc.contributor.authorCuetos Vega, Fernando 
dc.date.accessioned2015-02-02T11:44:02Z
dc.date.available2015-02-02T11:44:02Z
dc.date.issued2015
dc.identifier.citationBrain Topography, 28, p. 838-851 (2015); doi:10.1007/s10548-014-0403-5
dc.identifier.issn0896-0267
dc.identifier.issn1573-6792
dc.identifier.urihttp://hdl.handle.net/10651/29504
dc.description.abstractTraining readers to recognize pseudowords could decrease the processing differences between them and real words while clarifying the lexical acquisition processes. We analyze the effect of pseudoword repetition through the recording of EEG during a lexical decision task. Results showed a functional dissociation between two well-known ERP components: FN400 (Frontal N400, traditionally related to semantic processes) and LPC (Late Positive Complex, related to memory processes). On the one hand, FN400 was unaffected by pseudoword repetition and showed the typical lexicality effect. On the other hand, topographic and neural source analyses showed that LPC amplitude increased across repetitions, causing the lexicality effect to disappear, with the left inferior frontal, left superior temporal and right superior frontal gyri identified as the most likely neural sources. The lack of repetition effect on FN400 suggests that this component is unrelated to familiarity processes and is only influenced by semantic differences between stimuli. The LPC observations, however, reflect the construction and strengthening of visual memory traces for repeated pseudowords, facilitating their processing over the course of the task.
dc.description.sponsorshipThis research was funded by the Grants PSI2012-31913 and PSI2010-15184 from the Spanish Government and supported by a predoctoral grant from the Foundation for the promotion of Applied Scientific Research and Technology in Asturias
dc.language.isoeng
dc.publisherSpringer
dc.relation.ispartofBrain Topography
dc.rights© 2014 Springer
dc.sourceScopus
dc.source.urihttp://www.scopus.com/inward/record.url?eid=2-s2.0-84907486626&partnerID=40&md5=3c79d3d7acd9fd55b252a517f1e63109
dc.titleRepeated Exposure to "meaningless" Pseudowords Modulates LPC, but Not N(FN)400
dc.typejournal article
dc.identifier.doi10.1007/s10548-014-0403-5
dc.relation.projectIDMINECO/PSI2012-31913
dc.relation.projectIDMINECO/PSI2010-15184
dc.relation.publisherversionhttp://dx.doi.org/10.1007/s10548-014-0403-5


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