Answer:Eysenck's theory of personality
Explanation:Hans Eysenck’s PEN model of personality
According to this theory , Hans identifies three personality factors which are psychoticism , extraversion and neuroticism (PEN). He refers to these factors as bipolar dimensions which means there is a personality that opposes each of these three .
Extraversion vs. Introversion
Neuroticism vs. Emotional stability
Psychoticism vs. Normality
Eysenck held a belief thatt biological factors(i.e hormonal level) works along with environmental factors (learned behavior) all contribute to the personalities.