Resolution of the Assertiveness × Likability interaction in the 300–450 ms time window for the anterior ROIs in Experiment 1.

Effects of by-participant Assertiveness judgements on mean ERP amplitude differences in the Low-Likability (i.e. lower-than-median likability of the political speaker) and High-Likability (i.e. higher-than-median likability of the political speaker) groups as well as associated confidence intervals and p-values. Note that, since the by-ROI analyses reported here did not involve any random slopes, confidence intervals and p-values could be estimated using MCMC sampling [29].