Utilizing a similar methodology to Jones et al. (2006) and Rangaswamy et al. (2007), Andrew and Fein (In Press) analyzed evoked and total δ / θ event-related (ERO) power during a visual oddball task performed by long-term abstinent alcoholics (LTAAs) and non-alcoholic controls (NACs). Delta and theta frequency bands were selected for this analysis as the P3 ERP components were shown to be composed primarily of evoked power in these frequency bands (Jones et al., 2006; Rangaswamy et al., 2007). It was shown that, similarly to the P3b amplitude which is significantly reduced in the LTAA group (Fein and Chang, 2006), the δ evoked ERO power to target stimulus shows a significant reduction in the LTAA group compared to the NAC group. With appropriate statistical analyses, it was found that the evoked ERO power measures provided a different, but not independent representation of the differences than did the P300 ERP measures
