Etude du rôle des feedbacks visuels dans la supervision de l'orthographe grammaticale

(eng) Various cognitive control processes are generally assumed to take place in the production of written language. The studies reported in this thesis aimed at assessing the extent to which visual information is involved in such control operations that might underlie the production of number agreement. Sentences with various linguistic characteristics and target agreements were dictated to French speaking university students who were simply asked to write them down. They were required to do this in different conditions according to whether they could see what they were writing or not, and according to whether they were constrained by an additive cognitive load or not. Using a pen tablet allowed us to record and to analyze their writing online. Thanks to different measures based on errors, pauses (with the assumption that long pauses could reflect a pre-graphic control of the agreement), corrections (with the assumption that such corrections could reflect a post-graphic control of the agreement) and writing speed, we show that visual feedbacks impact the control of grammatical agreements. When they are suppressed, the proportion of errors increases but the writing speed decreases as well as the proportion of pre- and post-graphic controls. In addition, we showed that visual feedbacks impact the agreements control in various ways depending on the nature of the agreement and, in case of verbal agreement, on the linear distance with the subject.