Experiment 1: Mean RT changes (Test 1 – Test 2) in the three sessions.

<p>The top and bottom left panels are the three discrimination difficulty levels (easy, intermediate, and difficult). The bottom right panel is the grand averages of RT changes after collapsing all task factor levels. The error bars indicate the standard error of the mean (SEM). S-S, Sham-Sham; S-A, Sham-Anodal; S-C, Sham-Cathodal.