Working-memory updating under interference: press when the current letter matches the one from two steps earlier.
Rule: press only when the current letter matches the letter shown two steps earlier. Your score (0–100) blends accuracy with speed on correct hits.
Tip: keep your eyes on the center and use steady breathing. Fast but sloppy attempts usually reduce the final score.
The 2-back task is widely used because it forces continuous updating: each new stimulus shifts what is relevant (two positions back) and what must be ignored (the most recent item). This makes it a practical way to self-track short-term mental control under mild time pressure.
No. This is a simple cognitive task for self-tracking and comparison. It does not diagnose any condition and should not be used for medical decisions.
Working memory and attention are sensitive to sleep, stress, caffeine timing, distractions, and motivation. Compare averages across multiple sessions.
A miss is failing to press on a true 2-back target. A false alarm is pressing on a non-target—often due to confusing 1-back with 2-back.
Your history is saved locally in your browser. The score is also saved in the shared store (“Your results”).