Higher BIS-11 scores in alcoholics confirm previously reported findings of alcoholics having high trait impulsiveness (Chen et al., 2007, 2005). Alcoholics also showed higher omission (Go) errors but did not differ from controls in commission (NoGo) errors as well as on reaction time on the Go trials. There are several studies that have reported higher omission errors (Noel et al., 2007, Pandey, Kamarajan, 2012, Rubio et al., 2007) and comparable commission errors in alcoholics with equal probability Go/NoGo tasks (Kamarajan, Porjesz, 2005a, Karch et al., 2008, Pandey, Kamarajan, 2012, Rubio, Jimenez, 2007), as well as with frequent Go/rare NoGo tasks (Easton et al., 2008, Fallgatter et al., 1998). On the other hand, comparable omission errors (Bjork et al., 2004, Goudriaan et al., 2005, Kamarajan, Porjesz, 2005a, Karch, Jager, 2008) and higher commission errors have been reported in alcoholics using equal probability Go/NoGo tasks (Bjork, Hommer, 2004, Goudriaan, Oosterlaan, 2005, Noel, Van der Linden, 2007, Thoma et al., 2007) as well as with frequent Go/rare NoGo tasks (Salgado et al., 2009). Similarly, results for reaction time to the Go trials are
