Measure sustained attention, speed and accuracy
In this attention cancellation test, you must cross out every 3 and 8 as quickly and accurately as possible. This version uses a 3-minute timer and tracks speed, omissions, commission errors and a site score for progress.
Try Flanker if you want more response conflict and inhibition.
Try Stroop to combine attention, inhibition and decision conflict.
This task belongs to the family of cancellation tests. You search a large field of symbols and mark only the targets. In practice, that means sustained attention, visual scanning speed and resistance to careless mistakes.
This page reports the main practical indicators separately: Correct = targets found, Wrong = non-targets crossed out by mistake, Missed = targets left unmarked, Accuracy = correct marks divided by all marks, SP = reviewed progress, LB = wrong marks, LO = omissions.
The composite GMT score on this page is useful for personal tracking, local history, badges and leaderboard logic. It is not a substitute for official standardized norms from licensed paper materials.
Work line by line, do not rush the first 20–30 seconds, and use the same device when comparing sessions. Mobile is supported, but desktop is still better for precision.
This version uses a 3-minute timer, which matches the common paper format used in Polish 3/8 attention testing.
An omission means a 3 or 8 was present on the board but you did not cross it out before time ran out.
A wrong mark means you crossed out a digit that was not 3 or 8.
No. The leaderboard uses a GMT score built from correct hits, wrong marks and omissions. It is designed for site comparison, not clinical diagnosis.