Personality Taxonomies: Eysenck & Cattell

Overview of Personality Taxonomies

• Different researchers used factor analysis to derive trait clusters (“taxonomies”).
  • Raymond Cattell → 16 Personality Factors (16PF)
  • Hans Eysenck → PEN model (Psychoticism, Extraversion, Neuroticism)
  • Big Five & HEXACO emerged later yet show strong overlap with earlier work.
• Repeated, independent analyses converge on roughly the same higher-order structure → lends credibility to the models.
• Instructor’s goal: constantly cross-reference descriptions so you can see where traits in one system map onto another (e.g., psychoticism ↔ low agreeableness & low honesty–humility).

Eysenck’s PEN Model

Structure

• Three “super factors” (higher-order dimensions) derived from factor analysis:
  1. Psychoticism (P)
  2. Extraversion (E)
  3. Neuroticism (N)
• Each super factor sits on a continuum (high ↔ low). People fall somewhere along the spectrum, not in discrete boxes.

Psychoticism (P)

• High scorers: aggressive, cold, egocentric, impersonal, impulsive, antisocial, un-empathetic, solitary, tough-minded, cruel.
• Serial-killer pattern: childhood cruelty to animals, lifelong antisocial behavior.
• Gender difference: on average, men score ≈ $\text{2×}$ higher than women.
• Overlaps with Big Five “low Agreeableness” & HEXACO “low Honesty–Humility.”

Extraversion (E)

• High scorers (extroverts): sociable, lively, carefree, surgent, dominant, sensation-seeking, adventuresome, physically active.
• Low scorers (introverts): quiet, serious, prefer solitude, need more time to “recharge.” Not necessarily shy/awkward—just reach social-energy depletion faster.
• Energy-tank metaphor:
  • Extrovert ≈ efficient hybrid car (gets many “social miles per gallon”).
  • Introvert ≈ Humvee (burns fuel quickly; must refuel—be alone—more often).
• Research: extroverts, on average, are physically stronger—likely due to more group/active hobbies.

Neuroticism (N)

• High scorers: anxious, depressed, guilt-prone, low self-esteem, tense, moody, emotionally volatile, rejection-sensitive, slow to forgive.
• Low scorers: emotionally stable, calm, resilient.
• Conceptually related to Big Five “Neuroticism” and (for forgiveness) low Agreeableness.

Spectrums & “Ambivert” Myth

• All three PEN traits are continuous. Most people cluster around the mean (normal bell curve).
• “Ambivert” = simply average range on E; not a separate category.
• Only a small % occupy extreme poles (pure introvert or pure extrovert, etc.).

Biological Bases Proposed by Eysenck

• Wanted each dimension tied to measurable CNS properties.
• Extraversion: differences in baseline cortical arousal. Introverts start higher → more easily over-stimulated.
• Neuroticism: reactivity of the sympathetic nervous system. High N = hyper-reactive fight-or-flight circuitry.
• Psychoticism: hormonal & neurochemical profile → high testosterone + low monoamine oxidase (MAO) → less inhibition, more reward-seeking.

Empirical Evidence Supporting PEN

• Sedation threshold studies (barbiturates): introverts require larger doses to show sedation because baseline arousal already high.
• Boredom-tolerance experiments (quiet room, no devices):
  • Extroverts leave much sooner (low boredom threshold).
  • Introverts endure longer (the quiet lowers their arousal).

Critiques of PEN

• “Moderate heritability” argument weak—most personality traits show $h^2 \approx 0.40 – 0.50$.
• Omits traits later labeled Openness, Conscientiousness, Agreeableness, Honesty–Humility.
• Some PEN facets overlap heavily (e.g., parts of Psychoticism = low Conscientiousness and low Agreeableness).

Cattell’s 16 Personality Factor Model (16PF)

Surface vs. Source Traits

• Surface traits: clusters of observable behaviors that correlate.
• Source traits: underlying causes that generate those surface traits; core of personality.
• All surface traits stem from, and multiple surfaces can share, a single source trait.

Naming Convention

• Borrowed vitamin nomenclature: Factor A, B, C… in order of empirical confirmation.

The 16 Factors (extreme descriptions)

Empirical Applications of 16PF

• Marital stability study:
  • “Unstable” marriages = at least one formal step toward dissolution.
  • Couples with similar 16PF profiles → more stable, happier.
• Suicide-attempt profiles:
  • Both men & women attempters: higher Introversion, higher Anxiety, lower Conformity than general population.
• Aviation personnel:
  • Airline pilots & flight attendants show the opposite pattern of suicide-attempters → more Extroverted, less Anxious.

Cross-Taxonomy Connections & Overlaps

• Psychoticism ≈ low Agreeableness + low Honesty–Humility + low Conscientiousness.
• Extraversion (PEN) ≈ Extraversion (Big Five, HEXACO).
• Neuroticism (PEN) ≈ Neuroticism/Emotionality.
• Cattell’s 16PF factors can be re-factored into Big Five dimensions; several large meta-analyses show $\approx 5$ higher-order factors hidden inside the 16.

Practical & Ethical Implications

• Personality assessments may predict risky behavior (crime, coercive sex, cruelty, substance abuse).
• Gender differences (e.g., men higher in P) caution against stereotyping—distributions overlap.
• Knowing one’s placement on spectra can guide coping strategies (e.g., introverts scheduling recovery time).
• Misuse risk: labeling someone “psychotic” colloquially vs. clinically—important to clarify psychoticism ≠ psychosis diagnosis.

Key Metaphors & Examples

• Car-fuel analogy for Extraversion.
• “Life is already a scary movie” for high-arousal introverts.
• Boredom room experiment illustrates arousal-seeking vs arousal-avoidance.
• Sedative dosage illustrates baseline cortical arousal difference.

Common Misconceptions

• “Ambivert” is not a distinct type; it is the statistical norm.
• High introversion ≠ shyness/social incompetence; merely lower social-energy budget.
• Psychoticism in Eysenck ≠ clinical psychosis.

Key Terms & Abbreviations

• Factor analysis: statistical technique for uncovering latent variables.
• Super factor: higher-order dimension summarizing many lower traits.
• PEN: Psychoticism, Extraversion, Neuroticism.
• 16PF: Cattell’s questionnaire measuring 16 primary factors.
• Surface vs Source trait: observable cluster vs causal trait.
• Arousal: physiological & cortical activation level.
• Monoamine Oxidase (MAO): enzyme that breaks down neurotransmitters; low MAO linked with disinhibition.

Take-Home Points

• Multiple independent taxonomies converge on similar dimensions: evidence for a robust underlying structure of personality.
• Traits exist on continua; extreme categorical labels (introvert/extrovert) describe rare tails.
• Biological, behavioral, and situational evidence support—but also complicate—Eysenck’s biogenetic claims.
• Cross-model translation skill (e.g., mapping 16PF → Big Five) is crucial for integrating research findings.
• Understanding spectra assists both clinical assessment (e.g., suicide risk) and everyday self-management (e.g., social energy budgeting).