Out of the blue: Untangling the association between impulsivity and planning in self-harm

•Analyses suggest impulsivity has distinct cognitive and affective subtypes.•Affective impulsivity was related to a greater risk of self-harm.•Affective impulsivity did not differ between planned and unplanned self-harm acts.•Depression and anxiety mediated the affective impulsivity and self-harm link.

BackgroundPlanned and unplanned acts of self-harm may have distinct clinical and psychological correlates. Trait impulsivity is one factor that might be expected to determine whether self-harm is planned. Research so far has focussed on suicide attempts and little is known about how individuals engaging in planned and unplanned acts of self-harm differ. The aim of the current study was to examine how individuals who report planned self-harm, unplanned self-harm, and no self-harm differ in terms of impulsivity and affective symptoms (depression, anxiety, and activated mood).MethodAn online survey of University students (n=1350) was undertaken including measures of impulsivity, affective symptoms and self-harm. Analyses made use of a multinomial logistic regression model with affective and cognitive forms of impulsivity estimated as latent variables.ResultsTrait affective impulsivity, but not cognitive, was a general risk factor for whether self-harm occurred. There was no evidence of differences between planned and unplanned self-harm. Affective symptoms of depression and anxiety mediated the relationship between affective impulsivity and self-harm.LimitationsThe study was cross-sectional, relied on a student sample which may not generalise to other populations.ConclusionsTrait affective impulsivity is associated with self-harm but it appears to be mediated by depression and anxiety symptoms. The exact relationships between trait affective impulsivity, depression, anxiety and self-harm require further longitudinal research in clinical populations but might lead to improved risk assessment and new therapeutic approaches to self-harm.