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Processus centraux et périphériques en production écrite de mots : études comportementales, en neuroimagerie fonctionnelle et par stimulation magnétique transcrânienne

Abstract : Writing is a composite activity that involves central linguistic processes (phonological, semantic, orthographic) as well as peripheral and motor processes (allographic, preparation and execution of motor patterns). In our work, we first used a behavioral, psycholinguistic approach recording the dynamics of isolated words writing (latencies and writing speed) in order to try to understand, through the study of the effects of phono-orthographic regularity, how information is transmitted from the central to the peripheral level. The results plead in favor of a “cascaded” functional architecture in which the different processes are carried out in parallel during written production. We then attempted to highlight the central and peripheral components of the cerebral network involved in writing by first conducting a meta-analysis of neuroimaging data published in the literature and then by conducting two successive fMRI experiments in healthy subjects using a writing-to-dictation task and a written picture naming task. An extensive cortical and subcortical network, mainly left-lateralized, has been identified and our data confirmed the activation of two crucial areas in the left superior frontal cortex and the left superior parietal cortex. In last study, we used the technique of transcranial magnetic stimulation (TMS), allowing disrupting the cerebral activity of each of these two areas, in order to test hypotheses regarding their functional role. Although the results did not enable to clearly answer the questions we addressed, they stand for a first approach to the understanding the functional anatomy of writing through TMS and open up some perspectives for the understanding of the role of "cerebral centers" of written language production.
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https://hal.archives-ouvertes.fr/tel-01392506
Contributor : Samuel Planton Connect in order to contact the contributor
Submitted on : Thursday, November 10, 2016 - 5:11:07 PM
Last modification on : Wednesday, June 1, 2022 - 4:25:55 AM
Long-term archiving on: : Tuesday, March 14, 2017 - 6:01:43 PM

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  • HAL Id : tel-01392506, version 1

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Samuel Planton. Processus centraux et périphériques en production écrite de mots : études comportementales, en neuroimagerie fonctionnelle et par stimulation magnétique transcrânienne. Neurosciences. Université Toulouse III - Paul Sabatier, 2014. Français. ⟨tel-01392506⟩

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