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espanolDesde una perspectiva de la linguistica cognitiva, se evalua los efectos de las construcciones causativas en la actividad del area de Broca durante el procesamiento de eventos visuales causales y no causales. Las estructuras lexicas causativas (e.g., la bola anaranjada mueve a la bola purpura) describen solamente eventos causales directos mientras que las estructuras perifrasticas causativas (e.g., la bola anaranjada hace mover a la bola purpura) describen tanto los eventos directos como los indirectos. Basados en esta diferencia, se emplea estructuras causativas lexicas y perifrasticas como instrucciones verbales que dirigian a los participantes a juzgar si colisiones del tipo “bolas de billar” simulaban eventos causales directos, causales indirectos y no causales. Mediante el uso de resonancia magnetica nuclear funcional (RMNf ) y el analisis por region de interes se encontro que los juicios sobre los tres tipos de eventos activaron mas la region de Broca cuando eran precedidos por la instruccion perifrastica que cuando eran precedidos por la instruccion lexica. Por otra parte, los juicios sobre los eventos directos producian mayor actividad en el area de Broca que los eventos indirectos. Se encontro interesante que los juicios causales estuvieron asociados a actividad segregada en el pars opercularis y en el pars triangularis. Los resultados son discutidos en el contexto de la hipotesis del “priming” linguistico de categorias, los modelos lineales de acumulacion balistica y la organizacion jerarquica de la corteza prefrontal. Porque estos datos sugieren segregacion funcional durante los juicios causales, se propone una futura investigacion sobre la conectividad efectiva entre estas regiones empleando modelos causales dinamicos de RMNf. EnglishFrom a cognitive linguistics perspective, is assessed the effects of causative constructions on the activity of Broca’s area during the processing of visual causal and non-causal events. Lexical causatives (e.g., the orange ball moves the purple ball) describe only direct causal events whereas periphrastic causatives (e.g., the orange ball causes the purple ball to move) describe both direct and indirect causal events. Based on this difference, is used lexical and periphrastic causatives as verbal instructions that directed participants to judge billiards balls collisions depicting direct, indirect, and non-causal events. By using functional magnetic resonance imaging (fMRI) and region of interest analysis, is found that judgments of all three visual events more strongly activated Broca’s area following the periphrastic instruction than following the lexical instruction, and judgments of direct events produced stronger activity in Broca’s area than indirect events. Interestingly, causal judgments were segregated between pars opercularis and pars triangularis. Results are discussed within the context of the linguistic category priming hypothesis, linear ballistic accumulator models, and the hierarchical organization of the prefrontal cortex. Because this our data suggest functional segregation during causal judgments, it is proposed that effective connectivity between these regions is worth evaluating in a follow-up study via dynamic causal modeling of fMRI data.

BROCA'S AREA ACTIVITY IN THE LEXICAL SEMANTICS OF VISUAL CAUSAL EVENTS