Mentalizing Under Maternal Stress (MUMS):Using a baby simulator to investigate the impact of child-focused distress on maternal mentalizing and arousal

Parental mentalizing, or the parent’s capacity to think about the child as having an inner psychological world, has been shown to play an important role in sensitive parenting and child socioemotional development. Studies suggest that high levels of stress impair (parental) mentalizing, yet surprisingly few studies have experimentally investigated this. The present study aimed to address this gap by investigating the impact of child-focused stress on parental mentalizing measured using a newly developed self-report questionnaire, following an experimental design with a computer-controlled baby simulator in a sample of 29 community mothers. Both subjective arousal, measured by a self-report item, and biological arousal, assessed through galvanic skin response, were measured throughout the experiment. Attachment dimensions, childhood trauma, and borderline personality disorder (BPD) features were assessed at baseline. Results demonstrated that the induction of child-focused stress was associated with an increase in parental mentalizing difficulties. Increases in mentalizing difficulties were, in turn, associated with increases in subjective and biological arousal following the simulator task. Finally, attachment anxiety and childhood trauma were positively correlated with both arousal and parental mentalizing difficulties in the simulator task, whereas attachment avoidance and BPD features were not. The implications of these findings for early intervention are discussed.