PKP Kap. 7

What are the defining characteristics of trait theories and what are they fundamentally based on?

Scientific basis; objective measurement > intuition; personality psychology ≈ physical sciences; construct reliable, quantifiable measures before theorizing; contrast Freud/Rogers (subjective interpretation; unconscious emphasis).

Trait theories; personality = traits (broad, stable dispositions);

• (1) consistency (across appropriate (!) situations + time)

• (2) distinctiveness (individual differences); explain behavioral stability despite changing roles/environments.

Scientific functions of traits;

• (1) Description (universal taxonomy; classify all individuals within one framework);

• (2) Prediction (forecast real-world behavior from measured traits);

• (3) Explanation (some theories: identify underlying—primarily biological—causal mechanisms).

Core assumptions;

• (1) people possess broad behavioral predispositions;

• (2) overt behavior ↔ underlying traits (direct correspondence; ≠ psychodynamic view where reported calmness may reflect defensiveness/repression rather than true calmness);

• (3) personality organized hierarchically;

• (4) many traits assumed biologically influenced.

Methodological foundation;

• Factor analysis (clusters correlated behaviors/items → underlying trait dimensions);

  • Secondary factor analysis (factor-analyzes correlations among the initial factors themselves → higher-order “superfactors”);

• Strengths = objective, reduces hundreds of descriptors to a few fundamental traits;

• Limitations = factors are mathematical patterns requiring psychological interpretation; analytic choices → different personality structures (partially subjective).

Describe two trait perspective personality psychologists.

1. Gordon W. Allport (Conceptual foundation);

• Traits = real nervous-system structures; characterized by (1) frequency (how often expressed), (2) intensity (how strongly expressed), (3) range of situations (generalization across appropriate contexts);

• Freud visit → emphasize manifest motives > unconscious interpretations;

• Distinguish (1) traits (stable dispositions) vs (2) states (temporary emotions/moods) vs (3) activities (specific behaviors);

• Hierarchy = (1) cardinal (dominant, pervasive) vs (2) central (major general characteristics) vs (3) secondary traits/dispositions (specific, less consistent tendencies);

• Traits + situations jointly determine behavior (consistency + variability);

• Functional autonomy (adult motives become independent of childhood drives; initially extrinsic → intrinsically valued);

• Idiographic approach (study unique individuals via detailed case studies); later trait theorists adopted nomothetic population-based methods, arguably overlooking idiographic scientific value;

• Evaluation = major conceptual influence; criticized for limited empirical validation (e.g., traits × situations, biological basis largely untested) + see above

2. Raymond B. Cattell (Scientific classification);

• Goal = psychology’s “periodic table”: (1) surface traits (observable correlated behaviors) → factor analysis → 16 (2) source traits (latent dimensions); categories = (a) ability (skills; intelligence), (b) temperament (emotional/behavioral style), (c) dynamic (motivation/goals).

• Empirical strategy = (A) L-data (life records; 15 source traits) → (B) Q-data (16PF; 12 replicated + 4 questionnaire-specific traits) → (C) OT-data (objective behavioral tests; >500 tests; 21 OT source traits; “real coin” due to less bias/self-deception);

  • No one-to-one correspondence across methods; BUT source traits supported by cross-method factor analyses, cross-cultural/age replication, predictive validity, genetic evidence.

• Behavior determined by (1) traits + (2) states + (3) roles (situational influences).

• Evaluation = comprehensive, empirically rigorous taxonomy; criticized for (1) high complexity (16 traits), (2) measurement-driven theorizing (as opposed to 1. theory, 2. measurement; issue →), and (3) inability to capture richer personality aspects (e.g., life narratives).

• Application (Leadership);

  • Successful leaders = energetic, decisive, adaptive, assertive, sociable, achievement-oriented, stress-tolerant;

  • Top executives distinguished by integrity + understanding others // failure associated with insensitivity, untrustworthiness, arrogance, excessive ambition, moodiness, volatility under pressure, defensiveness.

Describe the third trait personality theorist.

Hans J. Eysenck (Biological trait theory)

• Goal = (1) simplify Cattell’s 16-factor model into a parsimonious, (2) biologically grounded theory; biological explanation needed to (3) avoid circular explanations (trait inferred from behavior → same trait used to explain behavior).

• Personality structure; secondary factor analysis (factor-analyzes correlations among first-order factors → higher-order factors) → 3 independent superfactors (highest-order dimensions):

  • (1) Extraversion (E) (sociability, activity, liveliness), (2) Neuroticism (N) (anxiety, moodiness, shyness), (3) Psychoticism (P) (aggressiveness, coldness, impulsivity);

  • Hierarchy = specific responses → habitual responses → traits → superfactors + Related Greek temperaments to combinations of E + N, suggesting long-standing, biologically based personality variation.

• Measurement;

  • (1) Eysenck Personality Questionnaire (EPQ) (self-report of E, N, P),

  • (2) Lie Scale (detects socially desirable responding/faking),

  • (3) objective behavioral tests (e.g., lemon drop test measuring salivation differences / differences between I + E!) to support biological foundations.

• Biological explanation; traits correspond to underlying biological systems rather than merely describing behavior (see research on E/I, N, P!)

• Psychopathology; disorders = (a) biological predispositions × (b) learning experiences;

  • high N → neurotic disorders;

  • high P + N + E → criminal/antisocial behavior (weaker learning of social norms); despite genetic influences

  • BUT behavior therapy effective because learning can modify behavior!

• Evaluation; strengths = scientific rigor, biological orientation, parsimonious model, major influence on modern personality psychology

  • Limitations = mixed support for biological mechanisms (especially N/P), better contemporary models, possible isolation of his research tradition, 3 superfactors may be insufficient to capture full personality complexity.

Are Eysenck’s hypotheses supported?

Overall; partially supported; strongest support = Extraversion; mixed/improving support = Neuroticism; weakest support = Psychoticism.

Extraversion (E);

• Hypothesis = (E) lower cortical arousal → stimulation seeking (extraverts) vs (I) higher cortical arousal → stimulation avoidance (introverts)

• Supported by (1) reward vs punishment learning (E → rewards; I → punishment), (2) twin studies (partial heritability), (3) cross-cultural universality, (4) stability over time, (5) correlations with biological markers (brain activity, heart rate, hormones, sweat glands).

• Behavioral evidence;

  • Introverts = ↑pain sensitivity, ↑fatigue, ↓performance under high stimulation (↑ under low stimulation), ↑careful/slower, ↑academic performance (esp. in advanced), ↑psychiatric dropouts, prefer solitary careers, intellectual humor, quiet study (react more to noise);

  • Extraverts = ↑performance under stimulation, ↑academic dropouts, social careers, novelty seeking, explicit sexual/aggressive humor, ↑sexual activity, ↑suggestibility (hyperventilation epidemic: affected girls = ↑E + ↑N), stimulating/noisy study environments, more breaks/social interaction.

  • Both perform best at their own optimal stimulation level!

Neuroticism (N);

• Hypothesis = hyperreactive limbic system + autonomic nervous system → stronger stress responses + slower recovery; original physiological evidence inconsistent

• Recent fMRI findings provide stronger support (↑N → greater prefrontal cortex activation VS. ↑E → greater insula but less cerabellar activation during emotional processing); precise neural mechanisms remain incompletely understood.

Psychoticism (P);

• Hypothesis = linked to genetic influences, testosterone, later dopamine activity (also implicated in schizophrenia); support comparatively limited.

Tree (PKP Kap. 7)