Fig. 2

The time course of stimulus presentations. A series of 75 color food pictures, consisting of 15 food items (a), and a series of 75 mosaic pictures, consisting of 15 mosaic pictures of food (b), were used. The order of the picture presentation was randomized for each series, and the sequences of pictures for presentation were randomly assigned for each participant. The mosaic pictures created from the same pictures of food items were used as visual stimuli in the same sequences as the food pictures during the control sessions. The original images used to generate the mosaic pictures were not disclosed to the study participants. Each picture was presented for 2.0 s followed by a fixation cross for 2.0 s