Editorial on the Research Topic The Locus of the Stroop Effect One of the famous Monty Python's Holy Grail scenes pictures the Knights of the Round attempting to cross the Bridge of Death. After seeing one of his fellow knights failing to answer a challenging question posed by the Bridge keeper and being cast into the Gorge of Eternal Peril, Sir Galahad nervously approaches the Bridge keeper who asks his name, his quest and.. . .his favorite color. Relieved, he answers with ease before being struck by a sense of dread after saying the color "blue." The problem, he realizes as he plummets into the gorge, is that his favorite color is in fact yellow.. . Even though individuals failing the requirements of the Stroop task (Stroop, 1935) are spared the dread Sir Galahad experienced, they are often heard self-correcting with some sense of consternation: "blue.. . .no yellow! Arghh!". The Stroop task requires participants to respond quickly to the color a word is printed in whilst at the same time ignoring the meaning of the word itself. The cost of failing to ignore the word is not a plunge into the Gorge of Eternal Peril, but is instead an incorrect response, or more commonly, longer response times compared to when naming the print color of a word that is not color-related (e.g., club in yellow). However, almost 30 years after the publication of MacLeod's (1991) seminal review paper, the locus of this so-called Stroop effect remains unclear. The aim of the present Research Topic was to address this still outstanding question.