S3. The fMRI session's objective is to study cognitive correlates of choice. Subjects will be placed in a 3Tesla fMRI scanner, with the gustometer, visual screen and rolling wheel available as in the S2. The functional fMRI scan will be done using high-resolution protocol (1,5*1,5*1,8mm) covering prefrontal, subcortical and occipital brain areas. Subjects will undergo 80 tastings. In 50% of tastings, they will view the three previously learned pictures and freely choose one of them, then receive 1ml of the drink associated with that picture. In the other 50% of tastings, the picture-drink pair will be received without the possibility to choose. The "no choice" tastings will be computed according to the results of "choice" tastings so that each drink will be consumed the same amount of times in "choice" and "no choice" context.