Attention Task

A continuous performance test used as one input alongside a clinical assessment. It is not a diagnostic test on its own.

Instructions

Letters will appear one at a time in the centre of the screen.
Press Space as fast as you can for every letter…
…except the letter X — when you see X, do nothing.
The task takes about 14 minutes and does not stop, so try to stay focused throughout.
Do it somewhere quiet, on a keyboard, with no other tabs or apps open.

A short practice runs first. The real task begins after it.

Patient identifier (initials or code — no full names) Session label (optional)

For the clinician

This instrument is designed for within-subject use: comparing a patient against their own prior sessions on the same device, not against population norms. It has no norms and produces no diagnostic score. Interpret it as one signal among the clinical interview, rating scales, and differential screen. Attention performance is also moved by sleep, effort, anxiety, and mood — a single run proves nothing.

Session summary

Metrics (this session)

Compare against this patient's baseline

Load one or more previously exported session files from the same patient on the same device. Two or more baseline sessions are needed before a change can be called meaningful (the first repeat carries a practice effect — use session 2 as the true baseline).

Interpretation caveats

This is a within-subject signal, not a diagnosis. It carries no norms and no percentiles. Scores are affected by sleep, effort, anxiety, mood, caffeine, and time of day. A change is only interpretable against this patient's own baseline on the same device, and only when validity flags are clean. Clinical interpretation and any diagnostic conclusion rest with the treating clinician.