Sources and References

Primary textbook — Funder, D. C. (2019). The Personality Puzzle (8th ed.). W. W. Norton and Company.

Supplementary texts — Larsen, R. J., & Buss, D. M. (2018). Personality Psychology: Domains of Knowledge About Human Nature (6th ed.). McGraw-Hill. | McAdams, D. P. (2015). The Art and Science of Personality Development. Guilford Press. | Mischel, W., Shoda, Y., & Ayduk, O. (2008). Introduction to Personality: Toward an Integrative Science of the Person (8th ed.). Wiley. | Leary, M. R., & Hoyle, R. H. (Eds.). (2009). Handbook of Individual Differences in Social Behavior. Guilford Press.

Online resources — APA PsycINFO database (landmark empirical studies); Society for Personality and Social Psychology (SPSP) open-access resources; Personality and Social Psychology Review; Journal of Personality and Social Psychology; University of Oregon Personality Lab lecture outlines (publicly available); Open Science Framework preregistered replication studies.

Chapter 1: Introduction to Personality Theory and Research

1.1 What Is Personality?

Personality psychology occupies a distinctive niche among psychological disciplines. Where social psychology asks how situations shape behavior for people in general, and clinical psychology asks how to alleviate suffering in specific individuals, personality psychology asks: what are the stable, organized, and consequential ways that people differ from one another? This question is at once conceptually simple and methodologically demanding.

Funder articulates a useful organizing construct called the personality triad, which highlights three core entities that personality research must account for:

1. Persons — the individual with her unique history, biology, motives, and cognitive schemas.
2. Situations — the social, physical, and temporal contexts that press on persons and elicit behavior.
3. Behaviors — the observable acts, verbal reports, and physiological responses that constitute the data of personality research.

A complete personality psychology must explain how persons and situations jointly produce behaviors. Neglecting any vertex of this triad leads to partial or distorted accounts.

1.1.1 Why Study Personality?

Personality traits predict a remarkable range of consequential outcomes: health and longevity, occupational success, relationship quality, political attitudes, criminal behavior, and subjective well-being. Beyond practical prediction, personality psychology addresses deep philosophical questions about human nature — the extent to which character is fixed or malleable, the role of free will in self-authorship, and the sources of human diversity.

1.2 The Grand Theories

Before modern empirical trait psychology consolidated, personality was dominated by sweeping theoretical systems constructed by clinically-oriented theorists. Although most grand theories are now considered scientifically limited, they remain intellectually influential and historically essential.

1.2.1 Sigmund Freud and Psychoanalysis

Freud proposed that personality is organized around three structural components: the id (the reservoir of primitive drives and wishes, operating on the pleasure principle), the ego (the reality-oriented executive mediating between id and external world), and the superego (the internalized moral authority). Conflict among these structures generates anxiety, which activates defense mechanisms — unconscious strategies (repression, projection, reaction formation, sublimation) that protect conscious experience from unacceptable material.

Freud also proposed a developmental account: the psychosexual stages (oral, anal, phallic/Oedipal, latency, genital). Unresolved conflicts at any stage produce fixations that color adult personality. The Oedipal conflict — children’s erotic attachment to the opposite-sex parent and rivalry with the same-sex parent — was for Freud the crucible of gender identity and moral development.

1.2.2 Carl Jung and Analytical Psychology

Jung broke from Freud on the nature of the unconscious. For Jung, the unconscious has two layers: the personal unconscious (unique to each individual) and the collective unconscious — a phylogenetic inheritance of universal symbols called archetypes (the Shadow, the Anima/Animus, the Self). Jung distinguished introverts (energy directed inward) from extraverts (energy directed outward), a distinction that prefigures the modern Big Five Extraversion dimension. His interest in cross-cultural mythology and symbolism has influenced humanistic and transpersonal psychology.

1.2.3 Alfred Adler and Individual Psychology

Adler emphasized social interest (Gemeinschaftsgefühl) — the innate potential for cooperation and concern for the community — and the drive to overcome inferiority feelings. His concept of the style of life (Lebensstil) — a unique, goal-directed pattern established in childhood — anticipates modern goal-theoretic approaches. Adler’s focus on conscious motivation, social context, and the future-orientation of behavior offered a corrective to Freud’s biological determinism.

1.2.4 Humanistic Approaches: Rogers and Maslow

Carl Rogers proposed that personality is organized around the self-concept — the individual’s perception of who she is — and the organismic valuing process — a natural tendency to move toward experiences that enhance growth. When the self-concept diverges from organismic experience (usually because significant others impose conditions of worth), incongruence and psychological distress result. Rogers’s person-centered therapy creates conditions of unconditional positive regard, empathy, and genuineness that allow the self-actualizing tendency to operate.

Abraham Maslow contributed the famous hierarchy of needs — physiological → safety → belonging/love → esteem → self-actualization. The key claim is that lower needs must be substantially satisfied before higher needs become motivationally salient. Maslow’s self-actualizing individuals are distinguished by characteristics such as acceptance of self and others, problem-centeredness, spontaneity, autonomy, and peak experiences.

1.2.5 George Kelly and Personal Construct Theory

Kelly argued that each person acts as a naïve scientist, constructing personal constructs — bipolar dimensions (e.g., honest–dishonest, warm–cold) — to anticipate events. Personality is the unique system of constructs a person uses. Kelly’s Role Construct Repertory Test (Rep Test) elicits constructs idiographically. Personal construct theory is notable for treating cognition — not drives or traits — as the basic unit of personality.

1.2.6 Behaviorism and Social-Cognitive Approaches: Skinner and Bandura

B. F. Skinner argued that personality concepts are unnecessary: behavior is fully explained by learning history and contingencies of reinforcement. “Personality” is merely the aggregated pattern of an individual’s reinforcement history. While radical behaviorism is no longer mainstream, Skinner’s insistence on observable behavior and functional analysis influenced behavioral assessment.

Albert Bandura synthesized behaviorism with cognitive psychology to produce social cognitive theory. Key constructs include observational learning (behavior acquired by watching models), self-efficacy (the belief in one’s capacity to execute behaviors needed to produce specific outcomes), and reciprocal determinism — the idea that persons, behaviors, and environments mutually determine one another. Self-efficacy is one of the most extensively validated constructs in personality psychology.

1.3 The Person–Situation Debate

1.3.1 Mischel’s 1968 Critique

Walter Mischel’s Personality and Assessment (1968) delivered a seismic challenge to trait psychology. Reviewing the empirical literature, Mischel concluded that personality trait scores rarely predicted specific behaviors with correlations exceeding .30 — which he called the personality coefficient. He argued that behavior is largely determined by situational variables, not internal traits, making trait concepts redundant.

1.3.2 Resolutions and Rebuttals

The debate generated productive theoretical responses:

• Aggregation principle (Epstein, 1979): Single behaviors are unreliable, but aggregating multiple behavioral observations dramatically increases predictability. A single observation of generosity predicts poorly; averaged generosity across many occasions correlates strongly with self-reported Agreeableness.
• Interactionism: Behavior is a joint function of person and situation. Powerful situations (e.g., a fire alarm) constrain individual differences; weak situations reveal them.
• If-then profiles (Mischel & Shoda, 1995): Stable personality is expressed not in cross-situational consistency but in stable patterns of situation-behavior contingencies. Person A becomes aggressive (B) when criticized (if A) but not when frustrated (if B); Person B shows the opposite pattern. Both profiles are stable and individually diagnostic.

The contemporary consensus is that traits are real, moderately heritable, and meaningfully predictive — especially when outcomes are aggregated and appropriate levels of analysis are chosen.

1.4 Personality Psychology’s Relationships with Adjacent Fields

Personality psychology intersects with:

• Clinical psychology: Personality disorders and the role of normal personality variation in psychopathology.
• Social psychology: Situationist tradition; social cognition approaches to the self.
• Developmental psychology: Personality over the lifespan; attachment and early temperament.
• Behavioral genetics: Heritability and gene-environment interplay.
• Neuroscience: Biological substrates of temperament and traits.
• Health psychology: Personality as a predictor of morbidity and mortality.
• Organizational psychology: Personality and occupational performance.

Chapter 2: Research Methods 1 — Data

2.1 The Four Types of Personality Data (S-B-I-L)

Funder’s classic taxonomy organizes personality data sources into four categories, each with distinctive strengths and weaknesses:

2.1.1 S-Data: Advantages and Limitations

Advantages:

• Access to private thoughts, feelings, and intentions unavailable to external observers.
• Efficient collection; standardized scales enable large samples.
• High face validity for phenomenological constructs.

Limitations:

• Self-presentation bias: Respondents may answer in a socially desirable direction (social desirability responding) or strategically manage their image.
• Self-knowledge limits: People have limited insight into their own cognitive processes, motivations, and behavioral tendencies (Nisbett & Wilson, 1977).
• Common method variance: Correlations between self-report measures may be inflated because both share the same measurement modality.

2.1.2 B-Data: Advantages and Limitations

Advantages:

• Less susceptible to self-presentation biases.
• Can capture implicit, automatic, or habitual behaviors the person is unaware of.
• High ecological validity when measured in naturalistic settings.

Limitations:

• Expensive and time-consuming to collect.
• Reactivity: People change behavior when they know they are being observed (Hawthorne effect).
• Single behavioral observations are unreliable; aggregation is necessary.
• Observer inference is required to code many behaviors, introducing subjectivity.

2.1.3 I-Data: Advantages and Limitations

Advantages:

• Informants have access to behavior across a wide range of situations and over long time periods.
• Average of multiple informant reports is highly reliable.
• I-data often predicts life outcomes better than S-data when the outcome involves external behavior.

Limitations:

• Relationship bias: Informants’ ratings are colored by the valence and nature of their relationship with the target.
• Stereotype effects: Informants may rate based on target’s social category rather than actual behavior.
• Informants have no access to target’s inner experience.

2.1.4 L-Data: Advantages and Limitations

Advantages:

• Objective and verifiable; not subject to report biases.
• High ecological and external validity — these are outcomes that matter in real life.

Limitations:

• Life outcomes are multiply determined; personality is only one contributor.
• Access is often restricted (privacy concerns, institutional barriers).
• Outcomes may reflect historical circumstance as much as personality.

2.2 Reliability

Three primary types:

Reliability is a necessary but not sufficient condition for validity. A measure can be perfectly reliable and entirely invalid (e.g., measuring ring size to assess intelligence).

2.3 Validity

2.3.1 Construct Validity and the MTMM Matrix

Campbell and Fiske (1959) proposed the Multitrait-Multimethod Matrix (MTMM) as a tool for assessing construct validity. The matrix requires measuring at least two traits with at least two methods, and inspecting:

• Convergent validity coefficients (same trait, different methods) — should be high.
• Discriminant validity coefficients (different traits, same method; different traits, different methods) — should be lower than convergent coefficients.

2.4 Measurement of Personality Traits

Modern personality assessment uses self-report questionnaires with Likert-type response scales as the workhorse. The NEO-PI-R (Costa & McCrae) remains the most widely used comprehensive trait inventory, assessing the Big Five and their 30 facets.

Structured interviews such as the Schedule for Nonadaptive and Adaptive Personality (SNAP) offer a middle ground between self-report and clinical interview. Implicit measures such as the Implicit Association Test (IAT) attempt to capture automatic associations outside conscious control, though their validity for personality constructs remains contested.

Chapter 3: Research Methods 2 — Designs and Analysis

3.1 Correlational Research

The correlational design examines the statistical relationship between two or more variables as they naturally occur, without experimental manipulation. It is the default design in personality research because most individual difference variables cannot be experimentally assigned (you cannot randomly assign people to be introverts).

Key limitation: Correlation does not establish causation. Three alternative explanations always exist for any correlation between X and Y: X causes Y; Y causes X; or a third variable Z causes both.

Partial correlation statistically controls for the influence of a third variable, providing stronger (though not conclusive) causal inference.

3.2 Experimental Designs

Experiments randomly assign participants to conditions and manipulate an independent variable to observe its effect on a dependent variable. Random assignment theoretically equalizes all individual differences across groups, allowing causal inference.

Personality experiments often use trait measures as moderating variables — examining whether the effect of a situational manipulation differs as a function of participants’ trait scores (a person × situation interaction).

3.3 Longitudinal vs. Cross-Sectional Designs

Longitudinal designs are essential for studying personality stability and change, gene-environment interplay over development, and the prediction of life outcomes from early personality.

3.4 Effect Sizes

Statistical significance depends on sample size and does not indicate practical importance. Effect sizes provide standardized measures of the magnitude of a relationship or difference.

3.5 The Replication Crisis

Beginning around 2011, psychology experienced widespread recognition that many published findings failed to replicate in independent samples. The Open Science Collaboration (2015) attempted to replicate 100 psychology studies and found that only ~36% showed statistically significant results in the same direction — a dramatic shortfall.

Contributing factors:

• Publication bias: Journals preferentially published significant findings, creating a file-drawer problem.
• p-hacking: Flexible analytical practices (optional stopping, outcome switching) inflated Type I error rates.
• HARKing (Hypothesizing After Results are Known): Post-hoc hypotheses presented as a priori.
• Small samples with insufficient statistical power.

Reforms adopted:

• Preregistration: Researchers publicly commit to hypotheses, design, and analysis plan before data collection.
• Open data and materials: Full transparency enables independent verification.
• Registered Reports: Journals commit to publication based on introduction and methods, before results are known.
• Larger sample sizes; multi-site collaborations.

Personality psychology is generally considered more robust than some other areas (e.g., social priming) because it relies heavily on well-validated trait measures and large samples, but vigilance is warranted.

3.6 Meta-Analysis

Meta-analysis statistically aggregates results across independent studies, providing more precise effect size estimates and identifying moderators of effects.

Key steps: systematic literature search; coding study characteristics; computing a common effect size metric; weighting by sample size; testing for heterogeneity; examining moderators via subgroup analysis or meta-regression.

Meta-analytic methods have been essential for settling personality debates — for example, demonstrating that the Big Five predicts job performance (Barrick & Mount, 1991) and that personality is moderately heritable across studies and cultures.

3.7 Person-Centered vs. Variable-Centered Approaches

Variable-centered approaches (correlations, regressions, factor analyses) treat variables as the unit of analysis, examining how dimensions relate across persons.

Person-centered approaches (cluster analysis, Q-sort methodology, narrative analysis) treat persons as the unit of analysis, identifying typologies or understanding the configuration of traits within individuals.

3.8 Ethical Considerations in Personality Research

• Informed consent and debriefing: Participants must understand what they are agreeing to; deception (when used) requires full debriefing.
• Confidentiality: Especially critical when collecting sensitive L-data (criminal records, medical files).
• Potential for stigma: Personality disorder research and genetic studies require careful handling to prevent discrimination.
• Use of findings: Personality assessment in employment, custody, and legal contexts requires careful attention to predictive validity, fairness across demographic groups, and potential for misuse.

Chapter 4: The Big Five Personality Factors

4.1 Historical Development: From Allport to the Big Five

4.1.1 Allport and the Lexical Hypothesis

Gordon Allport and H. S. Odbert (1936) undertook the first systematic application of the lexical hypothesis — the idea that the most important individual differences in human behavior are encoded as single words in natural language and that the structure of personality can be discovered by analyzing the personality-descriptive lexicon.

Allport and Odbert catalogued approximately 18,000 personality-descriptive terms from Webster’s Unabridged Dictionary, organizing them into categories. Allport distinguished cardinal traits (single dominant dispositions organizing a person’s life), central traits (the five to ten characteristic tendencies by which a person is recognized), and secondary traits (more situationally specific and peripheral tendencies).

4.1.2 Cattell’s Factor Analytic Approach

Raymond Cattell reduced Allport and Odbert’s list by eliminating synonyms and rare terms, then conducted factor analyses on ratings of persons on remaining terms, ultimately identifying 16 primary factors (forming the basis of his 16PF questionnaire). Cattell’s work established factor analysis as the central methodology for identifying personality structure.

4.1.3 Eysenck’s Three-Factor Model (PEN)

Hans Eysenck proposed a hierarchical model with three superordinate factors:

• Extraversion (E): sociability, assertiveness, positive affect vs. introversion.
• Neuroticism (N): emotional instability, anxiety, moodiness vs. stability.
• Psychoticism (P): callousness, impulsivity, aggressiveness.

Eysenck grounded his factors in biology: he proposed that Extraversion reflects individual differences in cortical arousal (introverts are chronically over-aroused and seek less stimulation), and Neuroticism reflects lability of the autonomic nervous system.

4.1.4 The Emergence of the Big Five

Independent research programs by Tupes and Christal (1961), Norman (1963), and later McCrae and Costa converged on five robust factors emerging from peer ratings and self-reports across diverse samples. The Big Five — named and characterized by their acronym OCEAN — achieved broad consensus by the late 1980s and early 1990s.

Key insight: The Big Five are not a theory but an empirical discovery — a robust descriptive taxonomy of the major dimensions of personality variation, emerging replicably from factor analyses of personality-descriptive language and questionnaire data.

4.2 The Five Factors: Definitions, Facets, and Correlates

4.2.1 Openness to Experience (O)

NEO-PI-R Facets: Fantasy, Aesthetics, Feelings, Actions, Ideas, Values.

Key correlates: Creativity, political liberalism, artistic interests, intrinsic motivation for learning, preference for variety.

4.2.2 Conscientiousness (C)

NEO-PI-R Facets: Competence, Order, Dutifulness, Achievement Striving, Self-Discipline, Deliberation.

Key correlates: Academic performance (r ≈ .25), occupational performance across virtually all job types, health behaviors, longevity, lower rates of antisocial behavior. Conscientiousness is the single strongest Big Five predictor of job performance.

4.2.3 Extraversion (E)

NEO-PI-R Facets: Warmth, Gregariousness, Assertiveness, Activity, Excitement Seeking, Positive Emotions.

Key correlates: Positive affect, subjective well-being, leadership emergence, career success in sales and management. Extraversion is the Big Five dimension with the most clearly specified biological substrate (dopaminergic reward sensitivity).

4.2.4 Agreeableness (A)

NEO-PI-R Facets: Trust, Straightforwardness, Altruism, Compliance, Modesty, Tender-Mindedness.

Key correlates: Relationship satisfaction, prosocial behavior, lower aggression and antisocial behavior, political conservatism (inverse relationship). Low Agreeableness is closely related to the Dark Triad (narcissism, Machiavellianism, psychopathy).

4.2.5 Neuroticism (N)

NEO-PI-R Facets: Anxiety, Angry Hostility, Depression, Self-Consciousness, Impulsiveness, Vulnerability.

Key correlates: Psychopathology risk (depression, anxiety disorders), relationship dissatisfaction, health complaints, lower subjective well-being. Neuroticism is the strongest Big Five predictor of psychopathology.

4.3 The Lexical Hypothesis and Cross-Cultural Replication

If the Big Five reflect universal dimensions of human variation, they should emerge from factor analyses of personality-descriptive adjectives in multiple languages. McCrae and Terracciano (2005) conducted a large cross-cultural study (N ≈ 12,000 across 51 cultures) and found that the Big Five factor structure replicated across cultures, though with some variation in factor loadings and the prevalence of sixth factors.

4.4 The HEXACO Model

Ashton and Lee (2007) proposed a six-factor model (HEXACO) adding Honesty-Humility (H) to the standard five: Extraversion, Agreeableness, Conscientiousness, Openness to Experience, and Emotionality (reorganized Neuroticism). The Honesty-Humility factor captures sincere, fair, and modest behavior versus greedy, deceptive, and self-important tendencies. HEXACO proponents argue it accounts for Dark Triad phenomena and cross-cultural data better than the Big Five.

4.5 Personality Hierarchies and Facets

The Big Five exist within a hierarchy:

• Superordinate factors (or “meta-traits”): Plasticity (Extraversion + Openness) and Convergence/Stability (Conscientiousness + Agreeableness + low Neuroticism) have been proposed at the apex.
• Broad traits (Big Five level)
• Facets: 30 facets in the NEO-PI-R (6 per factor)
• Nuances: Item-level specific variance

The bandwidth-fidelity dilemma (Cronbach & Gleser, 1965) arises here: broad traits (high bandwidth) predict broadly but imprecisely; narrow facets (high fidelity) predict specific outcomes more precisely but have narrower scope. Whether to use Big Five factors or facets depends on the research question.

4.6 Personality Profiles and Prototypes

Rather than treating each Big Five dimension independently, personality profiles (configurations across all five dimensions) can be analyzed. Cluster analysis of profiles often identifies three robust personality types:

1. Resilients: High Extraversion, Conscientiousness, Agreeableness, Openness; Low Neuroticism. Adaptive across contexts.
2. Overcontrollers: Average to high Conscientiousness and Agreeableness, low Extraversion and Openness, high Neuroticism. Rule-governed, somewhat anxious.
3. Undercontrollers: High Extraversion and Openness, low Conscientiousness and Agreeableness. Impulsive, novelty-seeking.

These types have been replicated across cultures and age groups (Asendorpf, Borkenau, Ostendorf, & van Aken, 2001).

Chapter 5: Using Personality Traits to Understand Behaviour

5.1 Personality Coefficients and the Aggregation Principle

The “personality coefficient” critique (Mischel, 1968) — the claim that personality-behavior correlations rarely exceed .30 — is partially answered by aggregation. Seymour Epstein (1979) demonstrated that aggregating behavioral observations across occasions and situations dramatically improves predictive validity, because random situational noise averages out, allowing trait signal to emerge.

The implication is that traits are best evaluated against aggregated behavioral criteria (e.g., average extraversion-relevant behavior over a month) rather than single behavioral episodes.

5.2 Situational Specificity vs. Cross-Situational Consistency

Most behavior shows both situational specificity and cross-situational consistency. People are not perfectly consistent robots; they modulate behavior in response to contextual demands. But they are also not chameleons — their average tendencies, emotional tones, and interpersonal styles are recognizable across contexts.

Funder and Colvin (1991) found that peer ratings of personality predicted behavioral observations in a laboratory interaction, and that these behavioral signatures were recognizable to knowledgeable informants — supporting the reality of cross-situational consistency.

5.3 The Bandwidth-Fidelity Dilemma Revisited

Narrow traits predict specific behaviors better; broad traits predict broader criteria better. In practice:

• Broad outcomes (general occupational success, overall well-being): Big Five factors are adequate.
• Specific outcomes (performance in a specific job role, a particular health behavior): Facets of relevant Big Five factors outperform the broad trait.

5.4 Personality and Life Outcomes

5.4.1 Academic Performance

Conscientiousness consistently predicts academic performance (r ≈ .20–.30 with GPA), over and above cognitive ability. Among Big Five factors, it is the strongest predictor. Openness predicts performance in humanities and creative domains; Neuroticism predicts test anxiety and performance decrements under evaluative pressure.

5.4.2 Occupational Success

Barrick and Mount’s (1991) meta-analysis examined the Big Five as predictors of job performance across five occupational groups. Conscientiousness was the only factor to predict performance in all groups (r ≈ .23). Extraversion predicted performance in managerial and sales positions specifically.

More recent meta-analyses (Ones, Dilchert, Viswesvaran, & Judge, 2007) confirm that personality adds incremental validity to cognitive ability in predicting occupational performance, particularly for jobs requiring interpersonal skill or self-management.

5.4.3 Health and Longevity

Conscientiousness is the strongest personality predictor of longevity (Friedman et al., 1993; Terracciano et al., 2008). The effect operates through multiple pathways: health behaviors (exercise, diet, smoking avoidance), occupational stability, avoidance of risky situations, and possibly direct physiological mechanisms.

Neuroticism predicts a wide range of physical health problems, though its effects are somewhat confounded with illness reporting and health anxiety.

5.4.4 Relationship Quality and Functioning

Agreeableness and Emotional Stability (low Neuroticism) predict relationship satisfaction. Neuroticism is the strongest Big Five predictor of relationship dissatisfaction and dissolution. Conscientiousness predicts relationship commitment and fidelity.

5.4.5 Political Attitudes

Openness to Experience consistently predicts political liberalism (Jost et al., 2003); Conscientiousness predicts conservatism. These associations are moderate (r ≈ .20–.40) and replicated cross-culturally, though the mechanisms remain debated (motivated cognition, aesthetic preferences for order vs. novelty, threat sensitivity).

5.5 Coherence vs. Consistency

Behavioral consistency refers to doing the same thing across situations. Coherence refers to expressing the same underlying disposition through different behaviors in different situations — behaviors that are phenotypically different but psychologically equivalent expressions of the same trait.

5.6 If-Then Situational Profiles

Mischel and Shoda (1995) proposed the Cognitive-Affective Processing System (CAPS), which predicts that personality is expressed in stable if-then behavioral signatures: “If situation A, then behavior X; if situation B, then behavior Y.” These profiles are stable within individuals and diagnostic of individual differences, even when cross-situational consistency is low.

Chapter 6: Personality, Stability, Development, and Change

6.1 Types of Personality Stability

Personality researchers distinguish multiple senses of stability:

6.2 Rank-Order Stability

Roberts and DelVecchio’s (2000) meta-analysis examined rank-order stability of personality traits from childhood through old age. Key findings:

• Stability increases with age, from r ≈ .31 in childhood to r ≈ .54 in the college years and r ≈ .74 by age 50–70.
• Even in older adulthood, stability is not perfect — rank-order changes occur at every age.
• The increase in stability from young to middle adulthood is consistent with the cumulative continuity principle (Caspi, Roberts, & Shiner, 2005): personality becomes increasingly stable as individuals select and create environments consistent with their dispositions, which in turn reinforce those dispositions.

6.3 Mean-Level Change: The Maturity Principle

Despite rank-order stability, average trait levels change systematically with age. Roberts, Walton, and Viechtbauer (2006) conducted a large meta-analysis documenting these changes:

Specific patterns:

• Conscientiousness: Increases throughout adulthood, especially during the 20s–30s.
• Agreeableness: Increases from early to middle and late adulthood.
• Neuroticism: Decreases modestly, especially for women.
• Openness: Peaks in early adulthood, then declines slightly in older adulthood.
• Extraversion: Declines slightly; the Social Vitality facet decreases more than the Social Dominance facet.

These changes are intrinsic maturational as well as socially mediated — they are partly triggered by life transitions (entering the workforce, becoming a parent) that create demands for responsible, agreeable behavior.

6.4 Cumulative Continuity

Selection: A conscientious person chooses demanding jobs that reward self-discipline, further strengthening that tendency. Evocation: A hostile person elicits hostility from others, which confirms their suspicious worldview. Construction: Extraverted individuals build social networks that provide ongoing positive social reinforcement.

6.5 Personality and Identity Development

6.5.1 Erikson’s Psychosocial Stages

Erik Erikson proposed eight psychosocial stages, each involving a crisis whose resolution shapes personality:

The identity crisis of adolescence — Erikson’s most influential concept — involves exploring and committing to values, beliefs, and roles. Marcia (1966) operationalized identity in terms of exploration and commitment, identifying four statuses: diffusion (no exploration, no commitment), foreclosure (commitment without exploration), moratorium (exploration without commitment), achievement (exploration followed by commitment).

6.5.2 McAdams’s Narrative Identity

Dan McAdams proposes a three-level model of personality:

1. Dispositional traits (Big Five): What you are like generally.
2. Characteristic adaptations: Goals, values, coping strategies, relational schemas — how the person pursues life tasks in specific contexts.
3. Integrative life narratives: The stories people construct about their lives to provide unity, purpose, and meaning — the narrative identity.

Key narrative features studied: narrative tone (optimistic vs. pessimistic), thematic content (agency vs. communion), narrative complexity, and redemptive sequences (turning bad events into good outcomes — associated with generativity and well-being).

6.6 Gene-Environment Interactions Across the Lifespan

The relative influence of genes and environments on personality is not fixed. Scarr and McCartney (1983) proposed that gene-environment correlation changes across development:

• In early childhood, passive gene-environment correlation dominates: parents provide both genes and environments.
• In adolescence, evocative and active gene-environment correlations increase as individuals select and shape their own environments.

This model predicts that heritability of traits should increase across childhood into adulthood — a prediction supported by longitudinal behavioral genetic data.

6.7 Interventions for Personality Change

Can personality traits be intentionally changed? Emerging evidence says yes, but modestly:

• Roberts et al. (2017) reviewed evidence that personality can be changed through behavioral interventions, psychotherapy, and major life events, though effect sizes are typically small.
• Hudson and Fraley (2015) showed that volitional personality change goals (participants chose to become more extraverted or conscientious) produced change over 16 weeks in the desired direction.
• Psychotherapy is associated with decreases in Neuroticism and increases in Conscientiousness and Agreeableness — consistent with therapeutic goals of emotional regulation and interpersonal functioning.

6.8 Personality in Older Adulthood

Contrary to earlier assumptions, personality in older adulthood is not simply stable. Beyond the mean-level changes described above:

• Very old adulthood (80+) shows increases in Neuroticism and decreases in Conscientiousness and Extraversion, possibly reflecting health declines and social losses.
• Personality in older adulthood predicts cognitive decline (Neuroticism) and protection (Conscientiousness, Openness) against dementia.

Chapter 7: Personality, Genes, and Evolution

7.1 Behavioral Genetics: Basics

Behavioral genetics uses differences between individuals to partition observed variance in traits into genetic and environmental components.

where VP = phenotypic variance, VG = genetic variance, VE = environmental variance. Heritability = VG / VP.

Environmental variance is further partitioned into:

• Shared environment (VEs): environmental factors making family members similar (parenting style, family SES, neighborhood) — typically denoted \(c^2\).
• Non-shared environment (VEns): environmental factors making family members different from one another (different peer groups, different birth-order positions, idiosyncratic experiences) — typically denoted \(e^2\).

7.2 Twin Studies and Adoption Studies

7.2.1 Twin Studies

Monozygotic (MZ) twins share ~100% of segregating genetic variants; dizygotic (DZ) twins share ~50% on average (like ordinary siblings). Comparing MZ and DZ correlations on a trait estimates heritability:

If MZ twins are far more similar than DZ twins, a large portion of variance is genetic.

7.2.2 Heritability of Big Five Traits

Meta-analyses (Bouchard & Loehlin, 2001; Vukasović & Bratko, 2015) converge on heritability estimates of approximately 40–60% for all Big Five traits. A representative summary:

A striking finding: shared environmental effects are near zero for all Big Five traits in adult samples. This means that siblings raised in the same home are no more similar in personality than would be predicted from their shared genes alone.

7.2.3 Adoption Studies

Adopted individuals share environments but not genes with adoptive family members, and share genes but not environments with biological relatives. If personality similarity tracks biological relatedness rather than environmental sharing, genetics is implicated.

The Minnesota Study of Twins Reared Apart (Bouchard et al., 1990) famously found that MZ twins raised in separate families were nearly as similar in personality as MZ twins raised together — a powerful demonstration of genetic influence.

7.3 Gene-Environment Correlation

Gene-environment correlation (rGE) occurs when individuals’ genetic predispositions are correlated with the environments they inhabit — a fundamental complication for simple nature-nurture distinctions.

Active rGE increases across development as children gain autonomy to select their own environments — one reason heritability estimates increase from childhood to adulthood.

7.4 Gene-Environment Interaction

Gene-environment interaction (G × E) occurs when the effect of a genotype on a phenotype depends on environmental context, or when the effect of an environment depends on genotype.

7.5 Molecular Genetics and GWAS

The genome-wide association study (GWAS) approach tests hundreds of thousands of single-nucleotide polymorphisms (SNPs) across the genome for association with a trait, without a priori hypotheses. For personality traits:

• Individual SNPs account for extremely small fractions of variance (typically r² < .001).
• The personality trait-associated variants are highly polygenic — thousands of variants each with tiny effects.
• Polygenic scores (PGS) — weighted sums of risk alleles across the genome — account for a modest but non-trivial proportion of phenotypic variance.

7.6 Evolutionary Psychology of Personality

7.6.1 Why Is Personality Variation Maintained?

If personality is heritable, natural selection should have driven traits toward a single optimal value over evolutionary time. The persistence of heritable variation in personality traits therefore requires explanation.

Frequency-dependent selection: The fitness advantage of a strategy depends on how common it is in the population. If most people are cooperative (high Agreeableness), defectors (low Agreeableness) gain fitness advantages; as defectors increase, their advantage decreases. This maintains equilibrium of variation.

Balancing selection and heterozygote advantage: Different trait values may have different advantages in different environments or life stages, maintaining polymorphism.

Life history theory: Personality variation reflects alternative life history strategies — the allocation of resources between survival, growth, reproduction, and parenting. Fast life history strategies (associated with risk-taking, early reproduction, low parental investment) vs. slow life history strategies (investment in long-term relationships, high parental investment, delayed reproduction) map onto personality profiles (low Conscientiousness and Agreeableness vs. high).

7.6.2 Cross-Species Personality

Personality-like individual differences have been documented in numerous non-human species, including primates, rodents, octopuses, and fish. Gosling (2001) reviewed evidence that personality dimensions analogous to Extraversion, Neuroticism, Agreeableness, and Openness appear across species. This cross-species consistency suggests that the biological substrates of personality are evolutionarily ancient and not uniquely human.

Chapter 8: Self-Esteem

8.1 Defining and Measuring Self-Esteem

The most widely used measure is the Rosenberg Self-Esteem Scale (RSES) — a 10-item Likert scale (e.g., “On the whole, I am satisfied with myself”; “At times I think I am no good at all”). It has excellent psychometric properties (α ≈ .88; test-retest r ≈ .85 over 2 weeks) and has been translated into dozens of languages.

Self-esteem should be distinguished from:

• Self-efficacy: Belief in capacity to perform specific behaviors.
• Self-concept: The entire set of beliefs about oneself.
• Narcissism: Inflated, grandiose sense of self-importance with entitlement and lack of empathy — conceptually related but distinct.

8.2 Sociometer Theory

Mark Leary and colleagues proposed sociometer theory as a functional account of self-esteem:

Key evidence: Self-esteem drops in response to social exclusion, rejection, and criticism; increases in response to social acceptance and positive evaluation. People are especially motivated to protect self-esteem when social exclusion is threatened.

This evolutionary account suggests that self-esteem evolved because social exclusion was fitness-threatening in ancestral environments — individuals who attended to their social standing and adjusted behavior to maintain group membership had higher survival probability.

8.3 Terror Management Theory

Jeff Greenberg, Sheldon Solomon, and Tom Pyszczynski proposed terror management theory (TMT) as an alternative account of why humans need self-esteem:

Key predictions and evidence:

• Mortality salience (reminding people of their death) increases defense of cultural worldviews and denigration of those who threaten them.
• Increasing self-esteem reduces death-related anxiety; decreasing self-esteem increases it.
• Mortality salience increases worldview defense (in-group favoritism, out-group derogation) — an effect replicated in over 200 studies across 26 countries.

8.4 Self-Enhancement vs. Accurate Self-Assessment

Empirical research documents a general positivity bias or self-enhancement tendency — most people rate themselves as above average on positive traits, as more responsible for successes than failures, and as less biased than others (“better than average effect”).

Optimal distinctiveness: People are motivated to both belong (similarity to others) and be unique (distinction from others). Self-enhancement satisfies distinctiveness needs by elevating one’s position relative to others.

Taylor and Brown (1988) argued that positive illusions (favorable self-evaluations, unrealistic optimism, illusion of control) are associated with better psychological well-being — a controversial claim. Colvin and Block (1994) found that self-enhancers were rated by friends and observers as less likable, more hostile, and more defensive — suggesting costs of self-enhancement.

8.5 Narcissism and Self-Esteem

Narcissism refers to an inflated, grandiose self-concept combined with entitlement, lack of empathy, and exploitativeness. It is important to distinguish from simply high self-esteem:

Narcissistic Personality Inventory (NPI) is the standard subclinical measure. Levels of subclinical narcissism have been argued to have increased in US college students over the last few decades (Twenge et al., 2008), though this claim is contested methodologically.

8.6 Contingent vs. Non-Contingent Self-Esteem

Crocker and Park (2004) identified common contingencies on which people stake their self-esteem: academic performance, appearance, social approval, virtue, family support, God’s love, and competition. Staking self-esteem on contingencies creates volatility and may paradoxically undermine learning (because failure becomes self-threatening rather than informative).

8.7 Implicit Self-Esteem

Explicit self-esteem is measured by self-report scales (like the RSES); implicit self-esteem is measured by reaction time tasks such as the Name Letter Effect (preference for letters in one’s own name) or the Implicit Association Test adapted for the self.

Discrepancies between explicit and implicit self-esteem may be revealing:

• Fragile high self-esteem: High explicit, low implicit — may reflect defensive self-presentation.
• Damaged self-esteem: Low explicit, high implicit — may occur in early depression recovery.

The validity and stability of implicit self-esteem measures remain debated; test-retest reliability is lower than for explicit measures.

8.8 Culture and Self-Esteem

Rosenberg scale scores are lower in East Asian than in North American samples, but the psychological function and correlates of self-esteem (relationship with well-being, depression risk) appear more universal than the level itself.

Chapter 9: Personality Processes

9.1 The Cognitive-Affective Processing System (CAPS)

Mischel and Shoda (1995) proposed the Cognitive-Affective Processing System (CAPS) as a dynamic, process-oriented model of personality that accounts for both cross-situational consistency and behavioral variability.

CAPS Units

Situations activate different subsets of these units; the stable pattern of unit activation across situations constitutes the individual’s personality.

9.2 Goals and Motivation

9.2.1 Personal Projects and Personal Strivings

Brian Little’s personal project analysis examines idiographic goal units — the projects people are currently pursuing (e.g., “finish my thesis,” “improve my relationship with my father”). Project dimensions (importance, progress, efficacy, stress, support, congruence with self-identity) predict subjective well-being over and above personality traits.

Robert Emmons’s personal strivings are motivational abstractions across specific actions — what a person is typically trying to do (e.g., “always be seen as competent,” “help others feel good”). Striving content (agency vs. communion) and conflict among strivings predict well-being.

9.2.2 Possible Selves

Markus and Nurius (1986) introduced possible selves — the individual’s ideas about what they might become, what they would like to become, and what they are afraid of becoming. Possible selves link personality to motivation by providing cognitive representations of feared and hoped-for future identities, which motivate current behavior.

9.2.3 Self-Determination Theory

Deci and Ryan’s self-determination theory (SDT) distinguishes intrinsic from extrinsic motivation and proposes three universal psychological needs:

Personality traits moderate SDT processes: Openness and Extraversion predict intrinsic motivation; high Neuroticism and low Agreeableness are associated with controlled, extrinsic regulation.

9.3 Narrative Identity

McAdams’s narrative identity concept (developed in the 1980s-2000s) represents the third level of his three-level model of personality. It is the story people construct about their lives — who they are becoming, what defines them, what they are trying to accomplish.

Key narrative constructs:

• Contamination sequences: Good scenes that turn bad — associated with depression and lower well-being.
• Redemption sequences: Bad scenes that turn good — associated with generativity, well-being, and psychological health.
• Agency themes: Mastery, self-expansion, status, achievement.
• Communion themes: Love, friendship, dialogue, care.

9.4 Emotion and Personality

Neuroticism/Negative Emotionality and Extraversion/Positive Emotionality are the two personality dimensions most directly linked to emotional life. Watson and Clark (1984) proposed the PANAS (Positive and Negative Affect Schedule) as orthogonal dimensions: Positive Affect (PA) correlates with Extraversion; Negative Affect (NA) correlates with Neuroticism.

Affective chronometry research examines not just average levels of affect but the dynamics of emotional reactivity and recovery:

• Neurotic individuals show greater emotional reactivity to stressors and slower return to baseline.
• Extraverts show faster positive affect recovery and more sustained positive responses to rewards.

9.5 Self-Regulation and Self-Control

Self-regulation refers to the processes by which individuals modify their thoughts, feelings, impulses, and behaviors to pursue goals and conform to standards. Self-control is a related construct emphasizing the capacity to override impulses.

Mischel’s delay of gratification paradigm (the “marshmallow test”) showed that preschool children’s capacity to wait for a larger reward predicted SAT scores, social competence, and other outcomes in adulthood — though the effect sizes in later, larger, better-controlled studies are smaller than original reports suggested (Watts, Duncan, & Quan, 2018).

9.6 Personality and the Unconscious

Modern personality research takes seriously that many personality processes operate outside awareness, including:

• Automatic emotional appraisals: Rapid, pre-conscious evaluation of stimuli as positive/threatening.
• Implicit motives (McClelland): Power, affiliation, and achievement motives that operate outside awareness and are measured by projective techniques (TAT/PSE), predicting behavior better than self-reported goals in some domains.
• Defense mechanisms: Empirically operationalized via Defense Mechanism Ratings (Bond) and Q-sort procedures; high-level defenses (e.g., sublimation, humor) predict adaptive functioning.

9.7 Embodied Personality

Emerging research links personality to bodily processes:

• Physiological substrates: Extraversion correlates with dopaminergic sensitivity; Neuroticism with amygdala reactivity and HPA axis dysregulation.
• Hormones: Testosterone correlates with dominance and risk-taking; cortisol with social anxiety and submission.
• Physical appearance cues: Observers can detect Extraversion, Conscientiousness, and dominance from photographs, body posture, and voice acoustics at above-chance accuracy.

Chapter 10: Personality Disorders and Health

10.1 What Are Personality Disorders?

Personality disorders must be distinguished from personality traits: disorders represent extreme, maladaptive, and inflexible variants of normal personality dimensions rather than categorically different phenomena. This conceptual continuity motivates dimensional models.

10.2 DSM-5-TR Classification: Three Clusters

The DSM-5-TR organizes 10 personality disorders into three clusters based on phenomenological similarity:

Cluster A — Odd/Eccentric

Cluster A disorders show genetic overlap with schizophrenia spectrum disorders; schizotypal PD in particular may represent a “schizophrenia spectrum” condition.

Cluster B — Dramatic/Emotional/Erratic

Cluster C — Anxious/Fearful

10.3 Dimensional vs. Categorical Models

The categorical approach of the DSM (you either have the disorder or you don’t) is widely criticized on empirical and conceptual grounds:

• Personality disorder diagnoses are highly comorbid — most individuals with one PD meet criteria for additional PDs.
• The boundaries between PDs, and between PDs and normal personality, are artificial.
• Categorical diagnoses discard information by collapsing dimensional variation into binary categories.

10.3.1 The Alternative DSM-5 Model for Personality Disorders (AMPD)

Section III of DSM-5 contains an Alternative Model for Personality Disorders (AMPD) that combines:

1. Level of personality functioning (criterion A): Self-functioning (identity, self-direction) and interpersonal functioning (empathy, intimacy) rated on a 5-point impairment scale.
2. Pathological personality traits (criterion B): 25 specific facets organized under five domains: Negative Affectivity, Detachment, Antagonism, Disinhibition, Psychoticism — which map inversely onto the Big Five.

10.3.2 Five Factor Model of Personality Disorders

The FFM-PD approach (Widiger & Costa) directly reconceptualizes each personality disorder as an extreme, maladaptive configuration of Big Five traits:

This approach makes personality disorders commensurable with normal personality variation and enables a fully dimensional system.

10.4 Etiology of Personality Disorders

10.4.1 Genetic Contributions

Twin studies estimate heritability of personality disorder dimensions at 40–60%, similar to normal personality traits. Cluster B disorders show stronger genetic contributions; shared environment contributes little.

10.4.2 Early Adversity and Attachment

Early adverse experiences — childhood abuse, neglect, unstable caregiving — are robust risk factors for personality disorder development, particularly Borderline PD. Attachment theory (Bowlby, Ainsworth) provides a framework: insecure attachment (anxious, avoidant, disorganized) in infancy is associated with personality pathology in adulthood.

10.5 Borderline Personality Disorder in Depth

Borderline Personality Disorder (BPD) is characterized by:

• Frantic efforts to avoid real or imagined abandonment.
• Unstable and intense interpersonal relationships (idealization-devaluation cycles).
• Identity disturbance.
• Impulsivity (spending, sex, substance use, reckless driving).
• Recurrent suicidal behavior, gestures, threats, or self-mutilation.
• Affective instability.
• Chronic feelings of emptiness.
• Inappropriate intense anger.
• Transient, stress-related paranoid ideation or dissociation.

Prevalence: ~1–2% general population; ~20% of psychiatric inpatients.

10.5.1 Biosocial Theory of BPD

Marsha Linehan’s biosocial theory proposes that BPD develops from the interaction of:

1. Biological emotional vulnerability: High sensitivity to emotional stimuli, high reactivity, slow return to baseline.
2. Invalidating environment: Caregivers who chronically negate, dismiss, or punish the child’s emotional expressions, failing to teach appropriate emotion regulation.

This developmental interaction produces pervasive emotion dysregulation — the core mechanism underlying BPD symptoms.

10.5.2 Dialectical Behavior Therapy (DBT)

Linehan developed Dialectical Behavior Therapy (DBT) as an evidence-based treatment for BPD. DBT combines:

• Individual therapy: Targeting motivation and applying skills to specific problems.
• Skills training group: Teaching four skill modules — Mindfulness, Distress Tolerance, Emotion Regulation, Interpersonal Effectiveness.
• Phone coaching: Between-session support for applying skills.
• Therapist consultation team: Preventing therapist burnout.

DBT is the most empirically supported treatment for BPD, reducing suicide attempts, self-harm, hospitalizations, and treatment dropout relative to control conditions.

10.6 Narcissistic Personality Disorder

Narcissistic Personality Disorder (NPD) features grandiosity (in fantasy or behavior), a pervasive need for admiration, and lack of empathy. Prevalence: ~0.5–1% general population; higher in clinical settings.

Research distinguishes:

• Grandiose narcissism: Overt, dominant, exhibitionistic — aligns with subclinical narcissism measured by the NPI.
• Vulnerable narcissism: Covert, hypersensitive, shame-prone — marked by fragility and reactivity to perceived criticism.

Both share the core deficit of self-regulation under ego threat.

10.7 Antisocial Personality Disorder and Psychopathy

Antisocial Personality Disorder (ASPD) requires persistent rule violations and disregard for others’ rights beginning in childhood (conduct disorder). Prevalence: ~3% males, ~1% females.

Psychopathy (Hare’s construct) is narrower: a pattern of affective deficits (shallow affect, lack of remorse, callous disregard) combined with antisocial lifestyle. The Psychopathy Checklist-Revised (PCL-R) is the gold standard for forensic assessment. Psychopathy is more strongly predictive of violent recidivism than ASPD.

10.8 Personality and Physical Health

10.8.1 Conscientiousness and Longevity

The Conscientiousness-longevity association is one of the most robust personality-health findings. Friedman et al. (1993) followed participants from Terman’s gifted children longitudinal study for decades; Conscientiousness in childhood significantly predicted survival into old age.

Pathways:

• Health behaviors: Exercise, diet, adherence to medical treatment, avoidance of smoking and risky behavior.
• Occupational stability and socioeconomic factors.
• Social relationship quality.
• Possibly direct psychophysiological mechanisms (inflammatory markers, HPA axis functioning).

10.8.2 Neuroticism and Health

High Neuroticism predicts:

• Elevated rates of depression and anxiety disorders.
• More physical health complaints.
• Poorer self-rated health.
• BUT: some evidence for the neurotic paradox — high Neuroticism individuals may attend more carefully to health symptoms and seek care earlier, providing some protective effects in specific contexts.

10.8.3 Type A and Type D Personalities

Type A behavior pattern (Friedman & Rosenman, 1959): Characterized by time urgency, competitiveness, and hostility. Originally associated with coronary heart disease risk; subsequent research identified hostility (low Agreeableness, high Neuroticism) as the specific toxic component, not the full Type A pattern.

Type D personality (“Distressed”; Denollet, 2000): Combination of Negative Affectivity (high Neuroticism) and Social Inhibition (avoidance of self-expression due to fear of rejection). Type D predicts adverse cardiovascular outcomes and poor quality of life in cardiac patients, over and above medical risk factors.

10.8.4 Personality and Immune Function

Emerging psychoneuroimmunology research links personality to immune function:

• Chronic hostility is associated with elevated pro-inflammatory cytokines (IL-6, CRP) and poorer wound healing.
• Extraversion and Openness are associated with stronger antibody responses to vaccination.
• Conscientiousness predicts better immune regulation partly through health behavior pathways.

End of PSYCH 356R: Personality — Course Notes (Winter 2026)