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Related Concept Videos

Longitudinal Research02:20

Longitudinal Research

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Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
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Introduction to Personality Psychology01:29

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Personality encompasses a set of enduring traits and behavioral patterns that define how individuals think, feel, and interact, ultimately shaping their unique identities. The concept of personality has deep historical roots, deriving from the Latin term "persona," which means "mask." This term initially referred to the roles played by actors in ancient theater, signifying the different facets individuals display in various contexts.
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Social cognitive perspectives on personality emphasize the importance of conscious awareness, beliefs, expectations, and goals in shaping behavior. These perspectives incorporate behaviorist principles, such as learning through reinforcement and conditioning, but extend beyond them by highlighting human reasoning and planning. Unlike traditional behaviorist views, social cognitive theory focuses on how individuals reflect on their past experiences and plan for future outcomes by considering...
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Personality Theory by Eysenck and Eysenck01:29

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Hans and Sybil Eysenck developed a widely recognized theory of personality, which emphasizes the role of temperament and genetically based differences in shaping individual traits. Their theory posits that biological factors primarily determine personality and can be understood through two main dimensions: extroversion/introversion and neuroticism/stability.
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Self-Report Tests of Personality01:22

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Self-report inventories are objective personality assessments that use multiple-choice items or numbered scales, typically ranging from 1 (strongly disagree) to 5 (strongly agree). They are often called Likert scales after Rensis Likert. These inventories are widely used due to their ease of administration and cost-effectiveness. One of the most prominent examples is the Minnesota Multiphasic Personality Inventory (MMPI), initially developed in the 1940s to assess abnormal personality traits.
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Longitudinal Studies01:26

Longitudinal Studies

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Longitudinal studies are also widely used in other medical and social science fields. For instance, in cardiovascular research, they can monitor patients' health over decades to identify risk factors for heart disease, such as high cholesterol or smoking, and evaluate the long-term effectiveness of preventive measures. Similarly, in mental health studies, researchers might follow individuals from adolescence into adulthood to understand the development and progression of conditions like...
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Related Experiment Video

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Using Cholesky Decomposition to Explore Individual Differences in Longitudinal Relations between Reading Skills
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Longitudinal within-person variability around personality trajectories.

Amanda J Wright1, Joshua J Jackson2

  • 1Department of Psychology, University of Zurich.

Journal of Personality and Social Psychology
|June 6, 2024
PubMed
Summary

Individual personality development varies significantly, with differences in within-person variability (sigma) being as important as average personality traits. This heterogeneity predicts health outcomes, challenging traditional linear models.

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Area of Science:

  • Psychology
  • Developmental Psychology
  • Personality Science

Background:

  • Established research identifies average personality development patterns across the lifespan.
  • These normative patterns may oversimplify individual developmental trajectories.
  • Novel metrics are needed to capture individual differences in personality development.

Purpose of the Study:

  • To examine individual differences in personality development using longitudinal data.
  • To investigate heterogeneity in within-person variability (sigma) around personality trajectories.
  • To assess the predictive utility of individual differences in sigma for health status.

Main Methods:

  • Utilized five large longitudinal datasets from diverse countries (N=128,345).
  • Employed mixed-effects location scale models to quantify within-person variability (sigma).
  • Examined associations between sigma, developmental covariates, and health outcomes.

Main Results:

  • Significant heterogeneity in within-person variability (sigma) was found across Big Five personality traits.
  • The magnitude of sigma heterogeneity was comparable to or greater than that of average trait levels (intercepts) and change rates (slopes).
  • Individual differences in sigma were associated with key developmental factors and robustly predicted health status.

Conclusions:

  • Within-person variability in personality development is substantial, valid, and practically significant.
  • Traditional linear models inadequately represent individual developmental pathways.
  • Incorporating individual difference metrics like sigma should become standard in personality development research.