Color psychology is the study of hues as a determinant of human behavior. Color influences perceptions that are not obvious, such as the taste of food. Colors can also work as placebos by having the color of pills be certain colors to influence how a person feels after taking them. For example, red or orange pills are generally used as stimulants. Another way in which colors have been used to influence behavior was, in 2000, when the company Glasgow installed blue street lights in certain neighborhoods which resulted in a reduced crime rate. Color can indeed influence a person, however it is important to remember that these effects differ between people. Factors such as gender, age, and culture can influence how an individual perceives color. For example, males reported that red colored outfits made women seem more attractive, while women answered that the color of a male's outfit did not affect his attractiveness.