“…In particular, poor impulse control has been reliably associated with a number of problem behaviors, such as physical bullying (Farrell et al, ; Pontzer, ), across a range of age groups (Campbell, Spieker, Burchinal, & Poe, ). Nonetheless, some researchers have questioned whether impulsivity on its own is sufficient to account for aggression (Hentges et al, ) and whether other variables, such as a callous disregard for others (Rhee et al, ), also are important. For example, it has been unclear whether impulsivity and HH are independent predictors of aggression in youth, as they have not been examined simultaneously in a single study.…”