The flanker task: the classic focus test behind Middle Arrow

Look at this row: ← ← → ← ←. Which way does the centre arrow point? Right, even though the four arrows around it point left. That small tug is the idea behind the flanker task, which researchers use to study how nearby information gets in the way of a quick choice. A flanker is simply an item beside the one you are meant to answer.

Why do the outside arrows get in the way?

The rule is easy: ignore them. But your eyes still take in the whole row. When the outside arrows point the same way as the centre one, the answer tends to come easily. When they point the other way, people often slow down or make more mistakes. Researchers call these rows congruent and incongruent, as a 2021 review of the arrow task by Ridderinkhof and colleagues explains.

Where did the task come from?

Barbara and Charles Eriksen ran the first experiments in 1974, with letters rather than arrows. They changed the letters around a target to see how much they interfered, and found that neighbours linked to a different answer could slow a person down.

The arrow version makes the conflict easy to see. The neighbouring arrows may agree with the centre one, disagree, or be neutral. Studies record both accuracy and response time, because a fast wrong answer and a slower right one tell different stories. And they look at the pattern across many trials, as in a 2017 study of attention during a flanker task, rather than reading anything into a single tap.

Try it on paper

Write these rows on a page, leaving space under each one:

1. → → → → →
2. ← ← → ← ←
3. → → ← → →
4. ← ← ← ← ←

Cover the rows below the one you are reading, and point in the direction of the centre arrow. The answers are right, right, left and left. Rows one and four agree all the way across; rows two and three pull against you. You might catch yourself pausing on those. If you don't, that is normal: a research task uses many more rows and times each one carefully.

For a second round, put a small dot above the centre position before you start. Does the reminder help you look at the target?

What can a Middle Arrow score tell you?

In a lab, the extra moment a conflicting row takes is part of what is measured. Middle Arrow has no clock on each answer, so you can look at the centre before you choose. How the game sets its level and its score is explained in a separate piece.

You can get better at Middle Arrow by learning where to look, and your score will show that change in the game. It won't tell you whether you focus better on homework or behind the wheel. The flanker task studies one particular kind of interference, and its results depend on details such as the display and the rules.

After a round, ask yourself something specific. Did the outside arrows pull you toward the wrong answer? Did you take enough care when they disagreed? Then play another round, looking at the centre first, and see whether it helps.