The BIS-15 (Spinella, 2007; Meule et al., 2011) is a 15-item short form of the BIS-11 for measuring trait impulsivity. Response categories range from rarely/never to almost always/always (scored from 1 to 4). Thus, higher values indicate higher impulsivity. Internal consistencies were α = 0.670 (attentional impulsivity subscale), α = 0.734 (motor impulsivity subscale), and α = 0.794 (non-planning impulsivity subscale) in the current study.