Study of interaction in somniloquy subjects

The aim of this study is, on one hand, to show how language can't be reduce to an act which involve only a single speaker (Saussure, 1915); and in the other hand, how, from the cognitive point of view, psycholinguistics cannot allow to understand the production of an act of language in its entirety. Indeed, it is impossible to understand the production of an act of language by studying a single speaker: ``Pour trouver dans l'ensemble du langage la sphere qui correspond a la langue, it faut se placer devant l'acte individuel qui permet de reconstituer le circuit de la parole. Cet acte suppose au moins deux individus; c `est le minimum exigible pour que le circuit soit complet'' (Saussure, op. cit., p. 17).We will attempt to demonstrate that verbal productions of subjects with sleep talking (also called somniloquy) consist in fact, of an interlocution with an imaginary speaker, in the course of which turn-taking are adapted, despite the interlocutor remains not approachable to the observer.