Although personality is generally consistent throughout the life span, some people exhibit major personality changes. The continuity and change in personality is explained by the biological, learning, situational, and cognitive factors. Such factors also interact to product change in the trait of shyness.
             Biological factors emphasize on the genetic component and brain function. Biologically, genetic components can make a person suffer from a life-long emotional instability. For example, schizophrenia is a genetic psychological disorder that continuously makes a person have mood swings. On the other hand, changes in personality can be caused by diseases, accidents, or drugs that correlate to physiological arousal and neurochemical changes. Diseases and accidents can damage a part of a person's front lobe, where then the person cannot think rationally and behave in a civil manner. Or, the lack of serotonin can lead to clinical depression, and thus cause the person to change his personality by altering his view of life from optimistic to pessimistic.
             Learning factors involves modeling and reinforcements. Children tend to model their parents' actions,
             Situational factors involve the environment and ones experiences. In general, culture establishes the norms, attitudes, and values that are passed along from one generation to the next and create consistencies over time; such stability enables a person's personality to be fairly stable. However, a particular disaster, such as the death of a family member, surviving through a tsunami, or a change in living environment, can alter a person's response to his life and thus change his personality.
             Cognitive Factors concern with a person's thinking, which affects ones view and responses, which therefore cognitive view affects the personality. For example, in the Ching Dynasty, Chinese men think women are socially inferior to them. However, as the communist party ...