Say I'm running a 4 color Stroop task, so I have 4 possible responses (e.g., green, red, blue, yellow), but for the stimulus red written in green, the only correct answer is green. I want participants to get a "wrong" feedback if they respond red, blue or yellow to this stimulus. (of course each color is assigned a key, e.g., D for red, F for green, G for blue, and H for yellow).
Thanks!