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Le lexique des verbes en dénomination orale : étude exploratoire chez l'aphasique et étude en IRMf chez le sujet sain

Abstract : Our study deals with the organisation of verb lexicon in aphasics, partly through an exploratory study of oral action naming using a video stimulus, and partly through an fMRI investigation in healthy subjects. According to our results, patients with different types of aphasia experience verb production difficulties. We observed a high rate of non conventional utterances, mainly verbal, in the form of semantic approximations. In aphasiology, the study of these utterances, which are associated with semantic paraphasia and are considered as errors, is limited to a nominal framework. We emphasise that these utterances demonstrate a verb lexicon structure based on semantic proximity, and signal the existence of a cognitive flexibility in the structure of the mental lexicon. In the literature, specific verb difficulties in aphasics are associated with frontal lobe lesions, but these data have been disputed. Using fMRI, we obtained fronto-parietal activations in the more posterior regions as well as activations in the thalamo-fronto-striate loop. Our results support the recruitment of all the cerebral regions. The stimulus used in our study may have enabled access via two pathways to the representation of the sensorimotor nature of verbs via the left middle temporal gyrus and the premotor areas. Videos appear to be a more ecological evaluative tool than images for studying the lexical processing of verbs.
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Submitted on : Tuesday, November 8, 2011 - 3:47:41 PM
Last modification on : Friday, September 18, 2020 - 2:34:36 PM
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  • HAL Id : tel-00639258, version 1


Mélanie Manchon. Le lexique des verbes en dénomination orale : étude exploratoire chez l'aphasique et étude en IRMf chez le sujet sain. Linguistique. Université Toulouse le Mirail - Toulouse II, 2011. Français. ⟨NNT : 2011TOU20066⟩. ⟨tel-00639258⟩



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