Evidence map›Paper›PMID 42006739›Full record

ArticleEuropean journal of personality2026

Exploring individual differences in volitional personality state and trait change: The role of motivation and engagement during a 12-week intervention.

Gabriel Olaru, Mirjam Stieger, Christoph Flückiger, Brent W Roberts, Mathias Allemand

Abstract read
In one paragraph

Article in European journal of personality, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.

0numbers the graph read from it
0cells of the map it votes in
3citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

3 citing papers in PubMed.

  1. Article
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors.

Gabriel OlaruDepartment of Individual Differences and Psychological Assessment, Charlotte Fresenius Hochschule, Germany.ORCID https://orcid.org/0000-0002-7430-7350
Mirjam StiegerInstitute of Communication and Marketing, Lucerne University of Applied Sciences and Arts, Switzerland.
Christoph FlückigerDepartment of Clinical Psychology, University of Kassel, Germany.
Brent W RobertsDepartment of Psychology, University of Illinois at Urbana-Champaign, IL, USA.
Mathias AllemandDepartment of Research and Development, University of Teacher Education Schaffhausen, Switzerland.ORCID https://orcid.org/0000-0002-1978-2044

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Recent studies suggest that personality traits can change through interventions, but little is known about what drives individual differences in intervention gains. Based on personality development and intervention frameworks, we examined whether achieved personality state changes explain differences in trait change and whether these could be explained by participants' motivation and intervention engagement. The study was based on a 12-week personality intervention with a total of 956 participants, daily and weekly state measures, and trait self- and observer-reports. Participants who showed stronger state deviations from the initial trait level changed more in their traits in the corresponding direction. Both state and trait changes were stronger if participants were more committed to their change goal, completed more implementation intentions, and enjoyed their implementations more (i.e., reinforcement). In contrast, the strength of the desire to change, expected attainability, and beliefs in the changeability of personality had no consistent effects-but individual differences were limited as most participants scored highly on these motivational aspects. The control group exhibited no mean-level changes or effects of any of these covariates. Taken together, these findings support key components of volitional change theories and can help guide future personalized intervention efforts.

Indexed as

intervention adherencemotivationPEACH studypersonality interventionpersonality statespersonality traits

Identifiers

PMID42006739
PMCPMC13089858

What OpenQuestion holds

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.