Un circuit pariéto-frontal des bascules perceptives en parole : une étude iEEG
Résumé
The verbal transformation effect refers to perceptual alternations while listening to a speech sequence repeated rapidly. This effect is a rich source of information about the speech processing mechanism in the brain. In addition, the verbal transformation effect provides a tool for studying the mechanisms related to attention and decision making (including speech segmentation). In this work, using intracerebral EEG recordings from two epileptic patients, we found gamma activity related to verbal transformations in the left frontal and the left supramarginal gyri. We discuss these findings in relation to perceptuo-motor links and dorsal circuit of speech perception. We also discuss the link with a possible parieto-frontal circuit, already displayed in other perceptual tasks.