Fig. 2

illustrates the experimental set-up of the single tast (ST) and dual-task (DT) during the functional magnetic resonance imaging (fMRI). During both visu-motor tasks four white circles are shown on a black screen with one circle blinking (turning grey) every 1.2 s. The participants will have a 2-button response box in each hand and use their index and middle fingers to respond to the circle turning grey by pressing the corresponding button. During the DT, participants will also perform a counting task, i.e. count how many white plus sign appearing on the screen during the block. After each DT-block, participants will be given four alternatives and respond with the corresponding button how many plus-signs they have counted