The mediating role of attachment and mentalising in the relationship between childhood trauma, self-harm and suicidality Maria Stagakia*, Tobias Nolteb,c, Janet Feigenbaumd, Brooks King-Casase, Terry Lohrenze, Peter Fonagyc,d, Personality and Mood Disorder Research Consortium, P. Read Montagueb,e,f,g a Division of Psychiatry, University College London, London, United Kingdom b Wellcome Trust Centre for Neuroimaging, University College London, London, United Kingdom c Anna Freud National Centre for Children and Families, London, United Kingdom d Research Department of Clinical, Educational and Health Psychology, University College London, London, United Kingdom e Fralin Biomedical Research Institute, Virginia Tech, Department of Psychology, Virginia Tech, Roanoke, VA f Department of Physics, Virginia Tech, Blacksburg, VA g Department of Psychiatry and Behavioral Medicine, Virginia Tech Carilion School of Medicine, Virginia Tech, Roanoke, VA *Corresponding author: Present address: Division of Psychology and Language Sciences, University College London, 26 Bedford Way, Bloomsbury, WC1H 0AP, London, United Kingdom E-mail address:
[email protected] Abstract Although the relationship between childhood trauma, self-harm and suicidality is well- established, less is known about the mediating mechanisms explaining it. Based on a developmental mentalisation-based theoretical framework, childhood adversity compromises mentalising ability and attachment security, which in turn increase vulnerability to later stressors in adulthood. This study aimed, thus, to investigate the role of attachment and mentalising as potential mechanisms in this relationship. In a cross-sectional design, 907 adults from clinical and community settings completed self-report questionnaires on retrospectively rated childhood trauma, and current attachment to the romantic partner, mentalising, self-harm, suicidal ideation and attempt.