The modified Stroop task successfully evoked interference effect as indicated by lower accuracy (F(1,19) = 40.8, p<0.0001 ) and longer reaction times (F(1,19) = 130.5, p<0.0001) to INCONG as compared to all other conditions, Fig. 1. Subjects were more accurate under placebo than alcohol as indicated by the main effect of beverage (F(1,19) = 12.3, p<0.005). There was no main effect of beverage or beverage by condition interaction on RTs. However, there was a strong main effect of condition (F(3,57) = 82.5, p<0.0001), with the slowest responses to INCONG (820±126 ms). Responses to CONG were the fastest (639±89 ms), differing from both RTs to NEUT (693±98 ms, F(1,19) = 81.7, p<0.0001) and READ (683±100 ms, F(1,19) = 12.9, p<0.005). Participants made more corrective responses on INCONG trials compared to all other conditions (χ2 = 4.8, p<0.05), and more under intoxication compared to placebo especially on INCONG trials (χ2 = 4.5, p<0.05), Fig. 1. Reduced accuracy under alcohol correlated with three measures of impulsivity: psychoticism scale of Eysenck’s Personality Questionnaire (r = −0.59, p<0.001), impulsivity scale on Eysenck’s Impulsiveness and Venturesomeness
