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Poster E33, Saturday, August 18, 3:00 – 4:45 pm, Room 2000AB

Temporal and spatial differences in the lexical and morphosyntactic incongruence processing

María Francisca Alonso-Sánchez1,2, Lucía Zepeda1,3, Pavel Prado3, Pedro Alfaro-Faccio4, Debra von Chrismar4;1Escuela de Fonoaudiología, Facultad Salud, Universidad Santo Tomás, 2Centro de investigación del desarrollo en cognición y lenguaje (CIDCL), Universidad de Valparaíso, 3Advanced Center for Electrical and Electronic Engineering (AC3E), Universidad Federico Santa María, 4Instituto de Literatura y Ciencias del Lenguaje (ILCL), Pontificia Universidad Católica de Valparaíso

Background: The language comprehension depends on several factors, among them, lexical and syntax processing. Access to lexical information is generated by activation through the pairing of accumulated information and by the inhibition of lexical entries competing for activation. Moreover, in spanish the assignment of the attribute feature, to the subject or the object in the clause, is determined among others by the gender and number congruency. The aim of this study was to determine the temporal and spatial differences of the lexical and morphosintactic processing. Methods: A study was conducted with event related potentials measurement with two lexical and two morphosyntax incongruence paradigm in 10 healthy subjects. Two lexical conditions were made, in and out of the lexical field incongruence. Otherwise, two morphosyntactic condition were made, gender and gender/number incongruence between the subject and the attribute of the verb. The ERP analysis was made with Brain Analyzer and the inverse solution was made with LORETA. Results: A statistical difference was showed in the latency of appearance of N400 and greater activation of precuneus, orbitofrontal, angular and supramarginal gyro in the condition of incongruence out of the lexical field. On the other hand, the latency of appearance of the P600 in the gender condition was larger (around 800ms) than the gender/number (around 600ms) condition. The activation patterns also show differences. Conclusion: the processing of lexical and morphosyntactic incongruence show a difference temporarily and in the pattern of brain activation.

Topic Area: Meaning: Lexical Semantics