At ages 17 and 23, psychopathy features were assessed via self-report using the Minnesota Temperament Inventory (MTI) – a 19-item research-based measure created before the development of many other currently used psychopathy rating scales. It contains 16 psychopathy items that were designed to tap the hallmark features of psychopathy originally outlined by Cleckley (1976). For the current study, we examined the two-factor, 13-item model reported by Loney et al. (2007). Specifically, these MTI items stem from two underlying psychopathy dimensions, which correspond in content to the Antisocial tendencies/lifestyle (or behavioral) and emotional Detachment (or affective) dimensions contained on other established psychopathy measures. Items on the MTI are rated on a 4-point scale (1 = this is not at all true of me; 4 = this is very true of me). Higher scores indicate higher levels of the scale’s dimension.
