<trial mytrial>/iscorrectresponse = [(picture.targets.currentitemnumber==2&&trial.old.response==51) || (picture.targets.currentitemnumber==1&&trial.old.response==52)]/validresponse = (51,52)/errormessage = true(error,500)</trial>
<text error>/ items = ("ERROR")/font = ("Arial", 32, 700, 0, 34)/ color = (red)/ position =(50,50)</text>
Many thanks,Charlotte :)