Compartmentalization is a psychological defense mechanism in which thoughts and feelings that seem to conflict are kept separated or isolated from each other in the mind. Those with post-traumatic stress disorder may use compartmentalization to separate positive and negative self aspects. It may be a form of mild dissociation; example scenarios that suggest compartmentalization include acting in an isolated moment in a way that logically defies one's own moral code, or dividing one's unpleasant work duties from one's desires to relax. Its purpose is to avoid cognitive dissonance, or the mental discomfort and anxiety caused by a person having conflicting values, cognitions, emotions, beliefs, etc. within themselves.