Tracking anger at self and others and non-suicidal self-injury cognitions and behavior: An ecological momentary assessment study in emerging adults

Although anger is theorised to play a key role in the manifestation of non-suicidalself-injury (NSSI), prospective research in real-world settings is limited. Therefore,the present study examines (1) whether individuals with and without a history ofNSSI differ in anger levels in their natural setting and (2) whether heightened self-or other-directed anger predicts NSSI cognitions (i.e. thoughts and self-efficacy toresist NSSI) and behaviour in daily life. Using ecological momentary assessment in60 emerging adults (ages 18–22) with and without past-year NSSI, participantscompleted eight daily surveys over 12 days, yielding 4,587 assessments (mediancompliance = 83.3%; IQR = 71.9–91.7). Emerging adults who used NSSI in the pastyear reported higher anger at self and others than peers without NSSI history, withhigher-than-usual anger at self, but not at others, predicting greater NSSI thoughtintensity and lower self-efficacy to resist NSSI 90 minutes later. Anger at self alsosignaled increased risk for NSSI behaviour, but this association became non-significant when controlling for NSSI thoughts. These findings highlight differencesin the object of anger between individuals with and without past-year NSSI andunderscore the clinical importance of interventions focused on reducing self-directed anger to decrease NSSI thoughts and ultimately prevent self-injury.