The perception of emotions using facial expressions reveals slight gender differences based on the definition and boundaries (essentially, the “edge line” where one emotion ends and a subsequent emotion begins) of the categories. The emotion of anger is perceived easier and quicker when it is displayed by males. However, the same effects are seen in the emotion of happiness when portrayed by women. These effects are essentially observed because the categories of the two emotions (anger and happiness) are more closely associated with other features of these specific genders.