Eysenck’s typology is hierarchically organized, and consists of types, traits, and habits.
On the basis of numerous factor analysis of personality data gathered from different subject populations all over the world, Eysenck derived two types that could readily be labeled: introversion/extraversion and stability/neuroticism.
Neurotics , in Eysenck’s view, are emotionally unstable individuals. Some unreasonably fear certain objects, places, persons, animals, open spaces, or heights; others exhibit obsessional or impulsive symptoms.
In this grouping we find the psychopaths - individuals who seem unable to assess the consequences of their actions and who behave in an asocial or antisocial manner regardless of the punishment meted out by others.
If psychotics and geniuses share the trait of creativity, why do geniuses produce outstanding works that contribute to society, whereas most psychotics spend their lives in institutions and fail to achieve greatness?
We have to consider combinations of personality traits.
Thus, the brains of extraverts react more slowly and weakly to stimuli, thereby creating a stimulus hunger, or desire for strong sensory stimulation, which causes them to seek excitement by approaching the environment, attending parties, making friends, taking risks, and so forth.
He believes that the basis for these differences is genetic: Introverts have chronically higher cortical arousal; arousal tends to facilitate learning; therefore, introverts learn more readily than extraverts.
In Eysenck’s view, neurotic behavior is most likely to be learned under certain environmental conditions.
The acquisition of disordered behavior by such individuals obeys the laws of learning, and these same conditioning principles can be used to eliminate the undesirable behaviors and to teach new, desirable ones.