Comprehensive Overview of Personality Psychology

Fundamental Definitions and Perspectives in Personality

• Personality (APA): Enduring characteristics and behaviors constituting a unique adjustment to life.

• Individual Differences (APA): The study of how each person is unique.

• Traits: Stable behavior patterns and tendencies consistent across situations.

• Adjustments: Resilience patterns and coping mechanisms.

• Historical Theory: Hippocrates proposed Temperament determined by $4$ humours (Blood, Phlegm, Yellow bile, Black bile). Franz Joseph Gall proposed Phrenology (skull shape). Sigmund Freud founded Psychoanalysis based on the Id, Ego, and Superego.

Six Major Domains of Personality Psychology

• Dispositional: Identification and measurement of core, consistent traits.

• Biological: Genetic, evolutionary, and brain function influences.

• Intrapsychic: Unconscious motives and internal psychological conflicts.

• Cognitive-Experiential: Conscious beliefs, emotions, and self-perceptions.

• Social and Cultural: Interpersonal relationships and societal influences.

• Adjustment: Resilience and adaptation to life's stress and health challenges.

Measurement, Research, and Evaluation

• Data Categories: Self-report (S-data), Observational (O-data), Test (T-data) via standardized scenarios, and Life-outcome (L-data) such as criminal or financial records.

• Evaluation Criteria: Reliability (repeatable results), Validity (Construct, Face, Predictive, Convergent, Discriminant), and Generalisability.

• Critical Thinking: Parsimony (preferring simple explanations).

• Social Cognitive Perspective (Bandura): Behavior results from Reciprocal Determinism between environments and personalities.

• Personal Control: Perception of power over environment vs. outside forces.

Major Trait Taxonomies

• Eynsenck’s PEN Model: Psychoticism, Extraversion, and Neuroticism.

• Wiggin’s Circumplex Model: Interpersonal dynamics organized by Love and Status axes.

• Five Factor Model (OCEAN): Openness, Conscientiousness, Extraversion, Agreeableness, and Neuroticism.

• HEXACO Model: Expansion adding Honesty-Humility as a sixth dimension.

• Inventories: NEO-PI-R ($240$ items), MMPI (clinical diagnosis), CPI (interpersonal effectiveness), $16PF$, and MBTI (criticized for limited reliability).

Trait Stability and Lifespan Dynamics

• Stability Types: Rank-order stability (relative standing), Mean-level stability (population averages), and Coherence (changing behavioral expression of stable traits).

• Trait Activation: Situations activate specific traits; weak situations reveal traits more clearly than strong, structured environments.

• Lifespan Trends: Extraversion, Neuroticism, and Openness typically decrease with age; Conscientiousness and Agreeableness increase.

• Expectancy Value Theory: Value placed on outcomes motivates behavior change.

Biological Domain and Heritability

• Heritability Stats: Neuroticism ($47\%$), Extraversion ($42\%$), and general Big Five traits (approximately $50\%$).

• Genotype-Environment Correlations: Passive (parent-driven), Reactive (environmental responses to traits), and Active (niche-picking).

• Physiological Markers: Electrodermal activity (EDA) for arousal, EEG for brain activity, and fMRI for blood flow.

• Eysenck’s Theory: Extraversion linked to baseline cortical arousal (ARAS).

• Gray’s RST: Behavioral Inhibition System (BIS) linked to Neuroticism; Behavioral Activation System (BAS) linked to Extraversion.

• Circadian Rhythms: Morning types ($22\,h$ cycles) vs. Evening types ($26\,h$ cycles).

• Cloninger’s Model: Linked Dopamine to novelty seeking and Serotonin to harm avoidance.

Evolutionary Psychology and Human Nature

• Selection: Natural and Sexual Selection (Intrasexual competition vs. Intersexual selection).

• Psychological Categories: Adaptations (problem-solvers), Byproducts (side effects), and Noise (random variations).

• Altruism Mechanisms: Kin selection and Reciprocal altruism.

• Sex Differences: Explained by Parental Investment Theory and Sexual Strategies Theory. Males often prioritize fertility cues; Females often prioritize status and resource-provisioning indicators.

• Group Inclusion: Social anxiety and self-esteem evolved as mechanisms to avoid ostracism and ensure belonging.

Intrapsychic and Humanistic Frameworks

• Freud’s Iceberg: Mental layers (Conscious, Preconscious, Unconscious) and defense mechanisms (Repression, Denial, Projection, Displacement, Sublimation).

• Psychosexual Stages: Oral, Anal, Phallic, Latency, and Genital.

• Erikson’s Psychosocial Stages: lifespan development focusing on Identity vs. role confusion.

• Motive Approach (Murray): Behavior driven by needs to reduce deficits. Big Three: Achievement, Power, Intimacy.

• Humanistic Tradition: Maslow's hierarchy ($5$ levels ending in Self-actualization); Carl Rogers' Person-Centered Approach emphasizing Unconditional positive regard and the Fully functioning person.

Cognition and the Self

• Personal Construct Theory (Kelly): Using mental templates to predict world events.

• Locus of Control: Internal vs. External attribution of life outcomes.

• Self-Structure: William James' 'I' (subjective knower) vs. 'Me' (object known). Components include Self-Concept, Self-Esteem, and Social Identity.

• Identity Crisis: Identity deficit (lack of direction), Identity conflict (clashing roles), and Identity pathology (instability found in BPD).

Personality Disorders and Stress

• Stress Models: Interactional, Transactional (Appraisal), Health Behaviour, Predisposition, and Illness Behaviour.

• Stress Mindset: Viewing stress as either enhancing or debilitating.

• DSM-5 TR Classification:

  • Cluster A (Odd/Eccentric): Paranoid, Schizoid, Schizotypal.

  • Cluster B (Dramatic/Emotional): Antisocial, Borderline, Histrionic, Narcissistic.

  • Cluster C (Anxious/Fearful): Avoidant, Dependent, Obsessive-Compulsive.

• Prevalence: Over $1$ in $10$ adults meet criteria for a personality disorder.