Participants were studied with fMRI, EEG, clinical, and neuropsychological testing. Ideally, all study procedures were completed within one month, but due to scheduling difficulties time between EEG and fMRI acquisition was sometimes longer. For the 41 participants that had both usable fMRI and EEG, 31 (76%) were acquired within one month, with the time between acquisitions of 6.57 ± 8.24 weeks for NSAC and 4.65 ± 9.48 weeks for LTAA (no difference between groups). LTAA subjects were required to stay sober throughout the study and did not drink between EEG and fMRI acquisitions; NSAC were asked to abstain from alcohol for 24 h prior to any lab visit, but may have continued drinking at their usual low level of drinking between visits and their alcohol use between study procedures was not monitored. A breathalyzer test (Intoximeters, Inc., St. Louis, MO) and a rapid oral fluid drug screen test (Innovacon Inc., San Diego, CA) for THC, amphetamines, methamphetamines, cocaine, opioids, and PCP was administered to all participants, with a negative result required for all participants at all sessions.
