What problem does it solve?
Sustained attention (vigilance) is the ability to maintain focus over time on a monotonous task. It's a key executive function — and it measurably declines within a single session for most people.
Letters flash one by one. Press Space when you see the specific sequence: A followed by X. Most trials are decoys — your job is to stay focused for the full 5 minutes.
What makes this one different
We measure the time-on-task drift — your accuracy in the first minute vs. the last minute. The difference is your vigilance decay — a sensitive marker of attention sustainability.
Press Space when you see A → X
Your accuracy across the 5-minute session. A downward slope = vigilance decay.
No sessions yet.
Sustained attention (vigilance) is the ability to maintain focus over time on a monotonous task. It's a key executive function — and it measurably declines within a single session for most people.
Drift of 5–10 percentage points across 5 minutes is normal. Above 20% means significant vigilance decay.
Hits above 80% is good for AX-CPT.
Long enough to show vigilance decay in most adults, short enough to fit in a break. If you want more challenge, run multiple sessions back-to-back.
That's normal — it's the whole point of the task. Practice reduces drift, but it never goes to zero.