Fig 2. Behavioral results.

(a) Stroop effect, as measured by the difference in reaction times between incongruent and congruent trials, is presented in the different experimental conditions. The Stroop effect is strongly reduced in the unmasked mostly-incongruent (MI) blocks compared to baseline, but no difference relative to baseline is observed for masked trials. (b) Reaction time is presented according to the current trial congruence and the previous trial congruence, both for physical repetition and change across the previous and current trials. A significant trial-to-trial conflict adaptation effect was observed, that was not modulated by physical repetition factor. (c) Stroop effect for unmasked trials is presented according to the visibility and the congruence of the previous trial. It is significantly different from baseline only when the preceding trial is unmasked and incongruent, suggesting an online evaluation of the instructed strategy.