There is evidence that pheromones are communicative signals in animals. However, the existence and function of human pheromones are still under discussion. During the last years especially 4,16-androstadien-3-one (androstadienone), found in male and female sweat, became subject of intense investigation. Data suggest that androstadienone modulates our attention and the processing of visual cues. This thesis examines in three experimental studies the effects of androstadienone exposure in men and women on behavioral and cortical reactions to visual and emotional stimuli. The results corroborate...