Toutes les categories grarnnatlcales utllls~.es daes un mod@le (Je traductlon Ariane sont formalls6es et eod~es de facon mn~monique en tant que variables et valeurs de variables. L'ensemble des variables d'un module donn(; constltue le vocabulatre du m6talangage qui permet de d#.crlre la langue source et la langue clble de ce mod61e. La structure de donn6es du systCme est une arborescence dolt ...

Introduction: Stimulus induced decreases in BOLD-fMRI signal, also known as negative BOLD responses (NBR) have been reported in visual [1] and somatosensory cortices [2]. Although its cause remains unclear, calibrated fMRI studies suggest that at least 60% of the NBR is neuronal [3] as opposed to being a haemodynamic (or steal) artefact. In addition, the magnitude of the NBR has been shown to i...