This computerized adaptation of the Counting Stroop asks participants to sort cards according to one of two sorting conditions. One at a time a card is shown on the screen, each bearing between 1 and 5 instances of a digit from 1 to 5 (e.g., three “4’s). Throughout the task five blocks (‘piles’) numbered 1–5 are shown at the bottom of the screen. In the congruent condition, participants are timed as they sort the cards, as quickly as possible, according to the number (digit) shown on the card (e.g., three “4’s” goes into the 4 pile). In the incongruent (conflict) condition, participants are timed as they do the same on the basis of the number of digits on the card (e.g., three “4’s” goes into the 3 pile). The Stroop Effect is the reaction time difference between the congruent and incongruent conditions. This task has the advantage over the classical color-naming Stroop in that it does not depend on skilled automatic reading (since poor readers will do paradoxically better on the classic Stroop). Functional neuroimaging studies have shown that for
