Trait Theory II in Personality Psychology

Personality Psychology Lecture 5: Trait Theory II

Opening Scenario

  • Context: Discussion between a psychologist and a physicist in a bar.

    • Psychologist's Point of View: Many psychological studies address constructs without physical substances.

    • Physicist's Argument:

    • Claim: Psychology is not a science due to lack of concrete mapping between constructs and physical phenomena.

    • Example: Electrons are constructs in physics used to explain atomic behavior; similarly, psychological constructs explain patterns of behavior.

    • Conclusion: For scientific validation, the focus must be on physical matter (e.g., neuronal or quantum mechanical levels).

The Five-Factor Model (FFM)

  • Discovery Background:

    • Fundamental lexical hypothesis states that personality traits are encoded in language.

    • Traits that are significant tend to be expressed simply in language (e.g., dictionaries, literature).

    • Proposal to perform factor analysis on personality descriptors seen in various contexts.

Cross-Cultural Universality/Equivalence

  • Importance: The most significant individual differences are likely to be captured as single terms across languages (Goldberg, 1990, p. 1216).

Replications of the FFM

  • Historical studies:

    • Norman's (1963) factor analysis of Cattell's items.

    • Goldberg's (1990) analysis of 1,431 trait descriptors.

    • Notable Traits Identified:

    • Surgency

    • Agreeableness

    • Conscientiousness

    • Emotional Stability

    • Intellect

    • Related Research: Costa and McCrae (1992)

    • Included Neuroticism, Extroversion, Conscientiousness, Agreeableness, Openness to Experience.

The Big Five Factors and Their Facets

  • Extraversion:

    • Facets: Gregariousness, Activity Level, Assertiveness, Excitement Seeking, Positive Emotions, Warmth.

  • Agreeableness:

    • Facets: Straightforwardness, Trust, Altruism, Modesty, Tender-mindedness, Compliance.

  • Conscientiousness:

    • Facets: Self-discipline, Dutifulness, Competence, Order, Deliberation, Achievement striving.

  • Neuroticism:

    • Facets: Anxiety, Self-consciousness, Depression, Vulnerability, Impulsiveness, Angry hostility.

  • Openness to Experience:

    • Facets: Fantasy, Aesthetics, Feelings, Ideas, Action Values.

Hierarchical Structure of NEO-PI-R

  • Costa and McCrae's structured model demonstrating the relationship between factors and facets of personality.

Research Validity of the NEO-PI

  • Research Findings:

    • High inter-rater reliability from various ratings (self, peer, spouse).

    • Cross-validation with external tools (Goldberg’s adjective checklist).

    • Integration with Cattell’s 16PF and Eysenck’s PEN model confirming the NEO-PI.

    • Biological correlates of the Big Five traits established.

Neural Correlates of Personality Traits (DeYoung et al., 2010)

  • Findings:

    • Extraversion: Associated with the medial orbitofrontal cortex.

    • Neuroticism: Found in parts of the PFC and other areas needing more exploration.

    • Agreeableness: Linked to the PCC and superior temporal sulcus.

    • Conscientiousness: Found in parts of the PFC.

    • Openness to Experience: No clear association could be established.

Evaluating DeYoung et al. (2010) Research

  • Contributions: A pioneering effort relating personality to neural science.

  • Criticisms:

    • High likelihood of false positives due to extensive NHST practices.

    • Brain functions do not act independently creating complications in findings.

    • Causality establishment issues and potential for circular reasoning in interpretations.

Growth and Development of Personality

  • Stability of Traits:

    • The Big Five factor scores remain stable across time, particularly in adulthood.

    • Stability does not imply a lack of change; variations among individuals remain.

  • Cross-Sectional Studies:

    • Survey indicating consistent changes in FFM scores across age groups, most significantly between ages 31 to 50 (Srivastava et al., 2003).

    • Suggests significant social input influences personality change.

Applications of the FFM

  • Workplace Implications:

    • Conscientiousness: Correlates with superior work performance; varies with job nature.

    • Subjective Well-being: Lower neuroticism correlates with higher well-being.

    • Longevity: Higher conscientiousness linked with longer lifespans; extroversion predicts health behavior, e.g., regular outdoor exercising.

Clinical and Personality Disorders

  • Clinical Implications:

    • Disorders can manifest as extremes within the FFM framework.

    • Examples: OCD linked to high conscientiousness, antisocial personality disorder linked to low agreeableness, impulsivity linked to high extraversion and low conscientiousness.

    • Treatment plans can consider personality dimensions (e.g., high openness therapies should promote exploration).

Transitioning from FFM to Five-Factor Theory

  • Conceptual Framework:

    • The Five factors regarded as the "universal raw material of personality."

  • Basic Tendencies vs. Dynamic Processes:

    • Basic tendencies such as neuroticism, extraversion, etc., form the core of personality.

    • Dynamic processes, including adaptations, environmental influences, and self-concept, contribute to behavioral manifestations.

Five-Factor Theory (McCrae & Costa, 1996)

  • Core Assertions:

    1. The five factors have a biological (genetic) basis.

    2. They exist within every individual.

    3. Environmental influences change adaptations but not the traits themselves.

    4. The traits significantly influence behavior.

Evaluating the Five-Factor Theory Claims

  • Factor Analysis as a Tool:

    • A method for simplifying complex data to efficient descriptors of variation.

    • Factor analysis claims: the five factors explain over 60% of covariances in responses.

    • Individual traits represented as linear combinations of the factors raises circular reasoning concerns.

  • Environmental Influence:

    • Developmental changes validated through large-scale studies.

    • Brain conditions, psychotherapy, and environmental changes can induce shifts in personality traits.

Conceptual Challenges in Trait Theories

  • Person-Situation Controversy:

    • Mischel (1968) argues against the assumption of consistent behavior across different environments.

  • Bottom-Up Theorizing Approaches:

    • Advancing personality theory by starting with observable biological systems and their associations with behaviors, leading to models such as the Reinforcement Sensitivity Theory (RST).

Reinforcement Sensitivity Theory (RST)

  • Neural Subsystems:

    • Behavioral Approach System (BAS): Responsive to positive stimuli.

    • Fight-Flight-Freeze System (FFFS): Responsive to negative stimuli.

    • Behavioral Inhibition System (BIS): Mediates conflict between BAS and FFFS.

    • RST provides a biologically grounded understanding of personality phenomena relating to impulsivity, fear, and anxiety.

Fundamental Problems of Trait Theories

  • Notion of personality traits as predictive models drew criticism; traits do not direct behavior as assumed.

  • Meta-Theoretical Suggestions:

    • To further understanding, theorize with ecological complexity, considering diverse societal niches affecting personality manifestation.

Key References

  • Corr, P. J., & McNaughton, N. (2008). Reinforcement Sensitivity Theory and personality.

  • Laajaj et al. (2019) Challenges to capture the big five personality traits in non-WEIRD populations.

  • Pickering, A. D., & Corr, P. J. (2008). J.A. Gray's reinforcement sensitivity theory (RST) of personality.

  • Smaldino et al. (2019). Niche diversity can explain cross-cultural differences in personality structure.