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Eysenck's Theory of Personality
Hans Eysenck (1916-1997) was born in Germany in 1916, but moved to England sometime around 1930's. Eysenck is recognized in many areas of psychology, including intelligence and mental illnesses, but he is most respected and recognized for his work within personality. Eysenck developed a trait theory of personality, which has been successful in influencing how we think about human personality in everyday life. Eysenck's Theory of Personality is based on biological factors and says that individuals inherit a type of nervous system that determines how they will adapt to the environment. It could be argued that Eysenck's main point of his Theory of Personality is personality relies on the balance of "excitation and inhibition process of the autonomic nervous system."

Eysenck's Theory of Personality is a factor analysis which consists of three main factors. These three factors include (three super traits); extroversion, neuroticism, and psychoticism and their opposites as-well which include:
 * Extroversion vs. Introversion
 * Neuroticism vs. Emotional Stability
 * Psychoticism vs. Socialization

Extroversion (first of the three super traits)
Extroversion can be characterized by being outgoing, talkative and being in need or taking deep pleasure in external stimulation. According to Eysenck, there is an optimal level of cortical arousal and your activity levels may decline if one becomes more or less aroused. This cortical arousal level is linked specifically to Extroversion because he believes those who are under-aroused are in need of a larger amount of external stimulation. Extroverts are more interested and put more energy towards the outer world and the people around them rather than their own personal world.

Adjectives of extroversion include: sociable, active, sensation seeking, assertive and dominant.

Introversion
Introverts are constantly over-aroused which causes them to seek out peace and attempt to avoid confrontation in order to keep them relaxed to balance out their arousal levels. Unlike Extroverts, they are introverts are concerned with their inner-thoughts and feelings more, rather than the outer-world. Introverts are more likely to spend a night in or rather work on a project independently rather than with a group.

Adjectives of introversion include: reserved, unsociable, quiet, passive, careful, thoughtful and peaceful.

Neuroticism (second super trait)
Neuroticism can be characterized by having a large amount of negative emotions and are prone to psychological distress. Some emotions that fall under this category would be anxiety and depression. According to Eysenck, Neuroticism is based on activation thresholds in the sympathetic nervous system. This part of the brain is responsible for the fight-or-flight response in the face of danger. Neurotic people have a very difficult time controlling their emotions which in-turn leads to them having a more negative state of mind.

Adjectives of neuroticism include: aggressive, moody, restless and anxious.

Emotionally Stable
Emotional Stability can be characterized by being consistent and 'reasonable' in your emotional reactions. Unlike those with Neurotic tendencies, it takes a a very high stressor to initiate negative emotions. This is due to 'high activation thresholds' and as mentioned having good emotional control.

Adjectives of emotional stability include: calm, carefree and reliable.

Psychoticism (third super trait)
Psychoticism can be characterized has inconsideration, recklessness, anti-social behaviors and anger that is tied with psychotic episodes which are essentially a disruption of reality. Eysenck believes that those with Psychoticism have higher levels of testosterone. These higher levels of testosterone to Eysenck result in higher levels of aggression and anger. It is important to acknowledge that in Eyesenck's Theory of Personality that 'psychoticism' is not referring to it as a mental illness but rather as anti-social behaviors.

Adjectives of emotional stability include: anti-social, impulsive, and aggressive.

Socialization
Unlike Psychoticism, the characteristics of Socialization according to Eysenck can be described as having the ability to restrain from one's impulses. It is to be in complete control of one's behavior, whether it be emotional or physical behavior.

Adjectives of self control include: calm, considerate and thoughtful.