The PCA based factors obtained from TRB as well as ERP variables are explained in Table 4. Total variance accounted for the TRB and ERP factors were 77.34 % and 52.49 %, respectively. The three TRB factors were: 1) Eight variables representing reaction times; 2) six variables of selection frequencies following Loss trends/trials; and 3) three variables of selection frequencies following Gain trends. The four ERP factors were: 1) Twelve variables representing ORN amplitudes during Loss (−50 and −10) conditions; 2) Nine variables of ORP amplitudes during −10 condition; 3) Nine variables of ORP amplitudes during +10 condition; and 4) Nine variables of ORN latencies during −10 condition. Table 5 shows the correlation between ERP factors and behavioral (TRB and BIS) factors. In the total sample, non-planning and motor impulsivity of BIS showed significant correlations with ERP factors 3 and 4 respectively. There was no correlation between ERP and TRB factors. In the control group, TRB factor 1 (reaction times) correlated with ERP factor 4 (ORN latencies during −10) and non-planning (BIS) correlated with ERP factor 3 (ORP amplitudes during +10). In the alcoholic group, TRB factor 1 (reaction times) correlated with ERP factor 1 (ORN amplitudes during loss conditions).
