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.

Advancing a Three-Tier Personality Framework for Posttraumatic Growth

Adversity has been assumed to foster positive personality change under certain conditions. In this article, we examine this assumption within the context of the three-tier personality framework integrating traits, characteristic adaptations, and narrative identity to provide a comprehensive understanding of personality growth. We first review findings on how adverse events affect personality on each of these three levels. Second, we summarize knowledge on event-based and person-based predictors of personality change in the face of adversity. Third, we specify affective, behavioral, and cognitive processes that explain personality change across levels of personality. Innovatively, our proposed process model addresses change at all three levels of personality, as well as similarities and differences in processes across the levels. We conclude by discussing unresolved issues, asking critical questions, and posing challenging hypotheses for testing this framework.

Stability and Change in Diffusion Model Parameters over Two Years

In recent years, mathematical models of decision making, such as the diffusion model, have been endorsed in individual differences research. These models can disentangle different components of the decision process, like processing speed, speed–accuracy trade-offs, and duration of non-decisional processes. The diffusion model estimates individual parameters of cognitive process components, thus allowing the study of individual differences. These parameters are often assumed to show trait-like properties, that is, within-person stability across tasks and time. However, the assumption of temporal stability has so far been insufficiently investigated. With this work, we explore stability and change in diffusion model parameters by following over 270 participants across a time period of two years. We analysed four different aspects of stability and change: rank-order stability, mean-level change, individual differences in change, and profile stability. Diffusion model parameters showed strong rank-order stability and mean-level changes in processing speed and speed–accuracy trade-offs that could be attributed to practice effects. At the same time, people differed little in these patterns across time. In addition, profiles of individual diffusion model parameters proved to be stable over time. We discuss implications of these findings for the use of the diffusion model in individual differences research.