Figure 1. A) Schematic representation of the experimental set-up for the tactile stimulation task. Participants were seated at a desk with their head resting on a chin rest. Tappers were attached to the right little finger, arm, and leg. B) Trial sequence. Participants had to fixate a central cross. After fixation, the trial started with a baseline period of 0.5 to 2.5 s, followed by the tactile stimulation and a post-stimulus period of 1.5 s. If the participant looked more than 3 visual degrees outside of the centre for more than 200 ms during the measurement period, the trial was invalid. Participants received feedback via a red or grey cross for 0.5 s. The feedback was followed by an intertrial interval of 1.5 s. Invalid trials were repeated at the end of each block.