When a valenced picture (e.g., positive) was presented at the centre of the screen (A), participants had to press the key corresponding to the valence category (e.g., the left key). When an E-group picture was presented at the centre of the screen (B), participants had to press the key corresponding to the E-group category (e.g., the right key). For each trial, the E-group response key was randomly combined either with the positive or with the negative response key.