Taste stimuli and presentation
chocolate flavored milk drink
We used two types of stimuli in this experiment: (1) a rewarding stimulus consisting of a chocolate milkshake solution and (2) a control stimulus consisting of a tasteless solution.We prepared the milkshake by mixing a chocolate flavored milk drink (300 g) with a Fior Di Latte flavored ice cream (60 g) for a total of 71 kcal/100 g.The tasteless solution, which was meant to be as close as possible to artificial saliva, was prepared in three steps. First, we diluted potassium chloride (KCl, 1.8 g) and sodium bicarbonate (NaHCOThe milkshake and the tasteless solution were kept in the fridge. We took them out simultaneously 30 minutes before the experiment so that they were delivered at ambient temperature.The apparatus used to deliver the liquids in the scanner has been described in Muñoz-Tord et al. [