Guest Lecture de Stéphanie Riès

Frontal control mechanisms in language production

23.05.2019 - 23.05.2019

Stéphanie Riès est Assistant Professor en neurosciences du langage à l'université de San Diego, Californie, USA, invitée du laboratoire Paragraphe

Adults fluidly utter 2 to 3 words per second selected from up to 100,000 words in the mental lexicon and only err once every 1000 words. Although seemingly easy, producing language is complex and depends on cognitive contrai processes that may be shared with non-!inguistic cognitive funclions. ln particular, cognitive contrai processes appear to be involved in helping us choose words as we speak. Despite the central importance of our capacity to produce language and the immense persona! and societal cost caused by ils disruplion, the spatio-temporal pattern of activation of the braln regions involved in word selection and the precise role of these brain regions are largely unknown. 1 will present results from scalp and intracranial electrophysiological studies and neuropsychological studies beginning ta shed light on these issues. These results support the hypotheses that posterior inferior left temporal cortex engages in word retrieval as semantic concepts become available. ln parallel, medial and left prefrontal cortices tune in witt1 lert temporal activity on a trial-by-trial basis, supporting top-down contrai over interference resolution for word retrieval Supporting these interpretations, computational modeling of neuropsychological data suggests the left PFC plays a raie in the adjustment of the decision threshold for word selection in language production in situations of interference caused by semantically-related neighbors. The implication of these findings for developing the understanding of acquired  (i.e.,  stroke-induced  aphasla)  and  developmental  language  disorders  (i.e.,  dyslexia)  and  the possible compensatory, anisms involved will de discussed.

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Date : jeudi 23 mai de 12h30 à 14h00

Lieu : Maison internationale de la recherche, Neuville-sur-Oise. Plan d'accès

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