Detecting Idiographic Personality Change

The associations between life events and person-centered personality consistency

OBJECTIVE

Few environments reliably influence mean-level and rank-order changes in personality-perhaps because personality development needs to be examined through an individualized, person-centered lens.

METHODS

The current study used Bayesian multilevel linear models to examine the association between 16 life events and changes in person-centered, Big Five personality consistency across 4 to 10 waves of data using four datasets (N = 24,491).

RESULTS

Selection effects were found for events such as marriage, (un)employment, retirement, and volunteering, whereas between-person effects for slopes were found for events such as beginning formal education, employment, and retirement. Within-person changes were often small and emerged inconsistently across datasets but, when present, were brief and negative in direction, suggesting life events can serve as a short-term disruption to the personality system. However, there were many individual differences around event-related trajectories.

CONCLUSION

Our results highlight that the effects of life events depend on how personality and its changes are quantified-with these findings underscoring the utility of a person-centered approach as it can capture the full range of these idiosyncrasies. Overall, these findings suggest that life events are associated with a range of idiosyncratic effects and can serve as a short-term, destabilizing shock to one's personality system.

Examining the impact of major life events on the frequency and experience of daily social events

OBJECTIVE

Life events can impact people's dispositional functioning by changing their state-level patterns of thoughts, feelings, and behavior. One pathway through which this change may be facilitated is changes in the experience of daily social events.

METHOD

We examined the dynamic relationship between major life events and the subsequent experience of positive and negative daily social events in a year-long longitudinal study (initial N = 1247).

RESULTS

Experiencing positive and negative major life events moderated the effects of positive and negative social events on event-contingent state well-being and ill-being in ways that were mostly (but not always) consistent with both endowment and contrast effects on judgments of well-being. Furthermore, negative life events predicted an increase in the subsequent trajectory of negative social events, while the experience of daily ill-being predicted the subsequent experience of negative social events.

CONCLUSIONS

These findings highlight the possible impact of major life events by explaining how they shape the subsequent experience of daily social events.

Trauma Exposure and Short‐Term Volitional Personality Trait Change

OBJECTIVE

Research into post-traumatic growth (PTG) finds individuals report positive changes in their identity, relationships, and worldviews after trauma. In a pre-registered 16-week longitudinal study, we examined trait change after recent trauma exposure to test an operationalization of PTG as positive personality change. We examined the influence of intrapersonal and social factors including motivation to change traits, perceived social support, and event centrality.

METHOD

Participants (n = 1004) reported on trauma exposure in past 1-month, centrality of each traumatic event, and social support. Participants with trauma exposure (n = 146) and a matched control group reported on their traits in 8 waves at 2-week intervals, and motivation to change traits in 3 waves.

RESULTS

Although some trait change was observed, it was not consistent with PTG. We found agreeableness declined in the trauma relative to the control group among participants who did not want to change in this trait. Conscientiousness declined for individuals with highly central traumas. Social support predicted increases in emotional stability, conscientiousness, and openness but only for individuals in the control group.

CONCLUSIONS

We discuss the value of defining PTG as positive trait change and suggest future directions including assessment of facet-level changes and ideographic methods.

What does a personality science approach to post-traumatic growth reveal?

Recent research has advocated for the value of conceptualizing post-traumatic growth as positive personality change. However, most research continues to use both methodologically suspect assessment tools and unsupported theoretical assumptions. How can personality psychologists contribute to the pursuit of high-quality research on this topic? The current special issue, which grew out of the European Association for Personality Psychology (EAPP) expert meeting on “Integrating Post-Traumatic Growth and Personality Change”, held at the University of Nottingham, on September 16–17, 2019, includes 15 papers that (1) examine short-term change in multiple personality constructs after adversity, (2) highlight the limitations of only assessing post-traumatic growth with retrospective questionnaires, and (3) provide theoretical and methodological recommendations for the continued advancement of the study of post-traumatic growth through the lens of personality psychology. While these papers all address specific ways to advance the personality science of post-traumatic growth, collectively they highlight the many unanswered questions that future research should tackle.

Interindividual age differences in personality structure

Most investigations in the structure of personality traits do not adequately address age; instead, they presuppose a constant structure across the lifespan. Further, few studies look at the structure of personality traits a-theoretically, often neglecting to examine the relationship among indicators within a trait (convergence) and across traits (divergence). Using a network approach, the present study examines (1) age differences in divergence and convergence, (2) the similarity between the Big Five and network structures, and (3) the consistency of network structure across age groups in a large, cross-sectional sample. Results indicate that convergence shows early gains in adolescence with few differences across the lifespan, while divergence mostly weakens across adulthood. The result of these age-related differences is that Big Five indicators only parallel the Big Five structure among young but not older adults. The structure of young adults tends to be quite similar while the network structures of older adults appear to greatly differ from one another. These results suggest that older adults have a different structure of personality than younger adults and suggest that future research should not assume consistency in personality structure across the lifespan.