Fig 1. The Stroop task paradigm.

In the beginning of each trial, an instructional cue consisting of either “word” for word-reading or “color” for color-naming was presented which was followed by a 1,3 or 5 second cue-target interval and an imperative color word stimulus (“red”, “blue” or “green”) written in colored letters. Any response would trigger a 3 second inter trial interval prior to the next cue. The time period of interest in this study was -500ms to 1500ms with 0ms indicating cue onset.