Figure 2.

Sample stimuli of the experimental stimulus set of 216 digital colour photographs showing another person’s left or right hand/foot in painful or non-painful situations. Subjects were instructed to choose between ‘non-painful’ and ‘painful’ for the task pain and ‘left’ and ‘right’ for the task laterality through button press within a time window of 4 ms (2.5 ms of stimulus display and 1.5 s of fixation).