Leon Festinger recognized cognitive dissonance, an inconsistency between one's actions and beliefs, which causes psychological discomfort. To alleviate this dissonance, people will change their belief, change their action, or change their perception of the action. However, salespeople, politicians, and others can manipulate cognitive dissonance to influence behavior, such as charities showing realistic disaster images to increase donations or politicians appealing to post-election party allegiance. While cognitive dissonance theory explains human sensitivity to inconsistencies, some scholars argue it may not reflect how little people consciously think about inconsistencies.