3.3. Eysenck's PEN Model Notes

Eysenck’s Concepts of Personality Theory

• Overview

  • Hans Eysenck proposed that certain inherited traits shape and stabilize human behavior across time and across situations. Traits are relatively stable and form the basis of personality (Eysenck, 1967, 1982; Eysenck & Eysenck, 1977).
  • Two-Factor Theory: built by analyzing responses to personality questionnaires using factor analysis to group behaviors into related sets (Eysenck, 1947).
  • PEN model: three main dimensions of personality: Psychoticism ($P$), Extraversion ($E$), and Neuroticism ($N$).
  • Development: Extraversion and Neuroticism were identified first; Psychoticism was added later to complete the model (often with Sybil Eysenck).

• Two-Factor Theory and the PEN Model

  • Factor analysis groups behaviors into clusters; these clusters become the core dimensions of personality in the PEN model.
  • The model attempts to capture the essence of personality with three primary traits rather than a long list of isolated traits.
  • Later literature and summaries emphasize that $P$, $E$, and $N$ together summarize relatively stable, heritable patterns of behavior.