a) Experiment 1 mean reaction times are displayed as a
function of task sequence (switch vs. repeat), stimulus congruency (congruent
vs. incongruent), switch proportion (25% vs. 75%), and incongruency proportion
(25% vs. 75%). b-e) Experiment 1 mean RTs are displayed as a
function of task sequence (panels b and c) and congruency (d and e), collapsed
across block-wise switch proportions (b and d) and block-wise congruency
proportions (c and e). The upper graphs in each panel depict mean RTs by subject
for each condition, and the lower graphs depict the mean RT difference between
conditions.