As a result, psychology shifted from theorizing to experimentation: prejudice and psychology, prejudices or stereotypes against certain groups of people influences other"s beliefs and expectations about others leading to racist behavior. Ie noting where the blod flows through the brain as people process information. Changes in blood flow represent changes in brain activity. Changes in brain activity indicate which part of the brain is being used. So, if people were more familiar with black faces, their reaction to their images in this sort of of study, wouldn"t activate their fear indicators in their brains. Psychologists note the importance and the affect of the social world in which we live, ie how people are influenced by the presence of others and certain situations that lead certain people to prefer certain types of people. This sort of mental activity results from biological process within the brain.