high risk subjects, as mentioned earlier, has often been equivocal with regard to gender- and age-based subgroups, the current study also investigates the effects of age and gender on P3 amplitudes in specific subgroups. It is expected that findings of the present study may shed further light on the complex relationship among reward processing deficits (indexed by P3 amplitude and CSD), impulsivity, and externalizing disorders involved in the development of alcoholism.