Figure 7. Alternative visualizations of the alcohol and placebo SPN waves in the Oddball task (left) and Regularity task (right). Top row shows SPN waves with 95% Confidence interval ribbon. When this falls below zero, difference between symmetry and random is significant at the 0.05 level. The horizontal blue line indicates mean SPN amplitude in the analysed window (highlighted yellow). The central row shows violin plots with descriptive and inferential statistics. The bottom row shows prior and posterior plots associated with Bayesian one sample t tests. Evidence for an SPN effect is overwhelming in all four conditions.