Fig. (2) An outline of the n-back task used. In the 1-back task, participants were instructed to press a response button if the presented digit was the same as the digit presented 1 side back. In the 2-back task, participants were instructed to press a response button if the presented digit was the same as the digit presented 2-slides back. In the 3-back task, participants were instructed to press a response button if the presented digit was the same as the digit presented 3-slides back