Figure 1.

Experimental design (EEG experiment). Subjects viewed either happy or fearful visual stimulus (a face or a scene) while listening to the word “plane” spoken in either happy or fearful tones. There were eight resulting conditions: congruent happy face, congruent happy scene, incongruent happy face, incongruent happy scene, congruent fearful face, congruent fearful scene, incongruent fearful face, and incongruent fearful scene. Subjects were instructed to identify the gender of the voice as either male or female (by means of a button press).