The Influence of Negative Emotion on the Simon Effect as Reflected by P300

Figure 1

The experimental procedure which illustrates the sequence of stimuli in a trial. Each trial began with a priming stimulus which was an emotional picture selected from the IAPS. Then, the target stimulus which was a red-and-black or green-and-black chessboard, presented to the right or left of a central fixation cross with a black-and-white chessboard always appeared as a filler opposite to the side of the target stimulus. Subjects were required to press the response keys according to the colors of the targets.