What is a false alarm?

Responding when a non-target letter appears — it reflects impulsivity or weak inhibition.

Is this a clinical ADHD test?

No. CPTs are used clinically, but this is a self-contained benchmark, not a diagnostic instrument.

Why hits minus false alarms?

It rewards both responding to targets and withholding on non-targets — the core of sustained attention.

Concentration

Can you stay focused and inhibit responses?

~6 min

For information and self-reflection

This assessment is not a medical or psychological diagnosis and not a clinical screening tool. It cannot determine whether you have a medical or mental-health condition. If you are concerned about your health, please seek advice from an appropriately qualified healthcare professional.

Concentration

~6 min

What this measures

Concentration is a Continuous Performance Task: sustain attention over a stream of letters and respond only to the target 'X'. It measures sustained attention and response inhibition.

How it works

Letters flash one at a time. Press the button only when you see 'X'. Pressing on any other letter is a false alarm. Your score is hits minus false alarms.

How results are calculated

Your primary score is hits minus false alarms (higher is better), estimated against population norms.

Accuracy & limitations

Fatigue and attention affect results. This is a research-grounded task (Evidence B), not a clinical evaluation.

FAQ

Keep exploring

Attention~5 min Visual Search~5 min Processing Speed~4 min

Last reviewed: 2026-08-14