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Childhood maltreatment is a known risk factor for the development of psychopathology and has consistently been linked to hippocampal volume reductions in adults, but not in children and adolescents. We propose that maltreatment\u2010related difficulties in coping with developmental tasks in adolescence and young adulthood might underlie the delayed emergence of hippocampal volume reductions in maltreated individuals. In a study with 196 healthy young adults (mean age [years]: 24.0\u00a0\u00b1\u00a03.2, 50% female, 20.6% living with a partner (missings: n\u2009=\u20092)), we investigated the interaction between childhood maltreatment (Childhood Trauma Screener) and the breakup of a steady romantic relationship (List of Threatening Experiences Questionnaire) on hippocampal magnetic resonance imaging grey matter volumes. The experience of a romantic relationship breakup moderated the association between childhood maltreatment and bilateral hippocampal volumes, revealing more negative associations with hippocampal volumes in participants with at least one breakup compared to those with no breakup experience (right hippocampus: \u03b2\u2009=\u2009\u2212 0.05\u2009\u00b1\u00a00.02, p\u2009=\u20090.031, p (FDR)\u2009=\u00a00.031; left hippocampus: \u03b2\u2009=\u2009\u22120.06\u2009\u00b1\u00a00.02, p\u2009=\u20090.005, p (FDR)\u2009=\u00a00.009). Moreover, our findings provide some evidence that childhood maltreatment is related to smaller bilateral hippocampal volumes only in those adults who suffered from a relationship breakup (right hippocampus: \u03b2\u2009=\u2009\u22120.23\u2009\u00b1\u00a00.10, p\u2009=\u20090.018, p (FDR)\u2009=\u00a00.018; left hippocampus: \u03b2\u2009=\u2009\u22120.24\u2009\u00b1\u00a00.10, p\u2009=\u20090.016, p (FDR)\u2009=\u00a00.018;). Our study highlights the interaction of adult social bonds with early adversity on vulnerability to psychopathology.<\/jats:p>","DOI":"10.1111\/ejn.16593","type":"journal-article","created":{"date-parts":[[2024,11,17]],"date-time":"2024-11-17T21:03:23Z","timestamp":1731877403000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["The association between childhood adversity and hippocampal volumes is moderated by romantic relationship experiences"],"prefix":"10.1111","volume":"61","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8580-1402","authenticated-orcid":false,"given":"H.","family":"Acosta","sequence":"first","affiliation":[{"name":"Department of Psychiatry and Psychotherapy Philipps University Marburg  Germany"},{"name":"The FinnBrain Birth Cohort Study, Turku Brain and Mind Center, Department of Clinical Medicine University of Turku  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