Disclaimer. This activity is not an assessment of attention conditions and does not diagnose anything. Full disclaimer

Sustained Attention Challenge

Press only for the right symbol. Hold back for everything else.

A free go/no-go attention challenge. Symbols appear one at a time; you respond to the target and hold back for everything else. Your score is balanced accuracy, which weighs catching targets and ignoring non-targets equally. It does not screen for or diagnose any attention condition.

Choose a level to startEntryStart here24 trials, half targets, 1.2 second response window.Regular20 balanced trials at a faster pace (1.0 second window).Hard20 balanced trials where the non-targets look much more like the target, at the same pace as Regular. Only the look-alike distractors change.

Start testAbout 1 minute · demo and practice first

What it measures

How well you respond to a target symbol and ignore others, reported as balanced accuracy, plus your median response time on correct targets.

DurationAbout 1 minute

Format24 symbol trials, half are targets

Device and setupKeyboard (Space) or one touch target.

Accessibility limitsRequires seeing small shapes and an internal line, and responding within 1.2 seconds.

Free resultBalanced accuracy and median correct response time

PrivacyYour answers are never sent to advertisers. Signed in, your results are saved to your account.

How the score works

Hits, misses, false alarms and correct rejections are combined as balanced accuracy: the average of your hit rate and your correct rejection rate. Median response time on correct targets is shown separately.

Worked example

With 12 targets and 12 non-targets, catching 11 targets (hit rate 92%) and correctly ignoring 9 non-targets (83%) gives balanced accuracy (92% + 83%) ÷ 2 = 87.5%. Pressing for every symbol would score only 50%, so guessing does not pay.

Entry, Regular and Hard

Entry: 24 trials, half targets, 1.2 second response window.
Regular: 20 balanced trials at a faster pace (1.0 second window).
Hard: 20 balanced trials where the non-targets look much more like the target, at the same pace as Regular. Only the look-alike distractors change.

Each level has its own fixed set of items and its own score, so results are only compared within the same level. How levels are designed

What Premium adds

Your basic score is always free. Premium adds: Misses, false alarms and speed profile. It also keeps your full history on every device and removes the ads. One upgrade covers all ten tests. See Premium

Limits

This activity is not an assessment of attention conditions and does not diagnose anything.

For education, entertainment and general self-exploration only. These activities are not medical or psychological assessments and do not diagnose, prevent or treat any condition. Results are estimates of performance on these tasks and can be affected by practice, attention, language, your device and your surroundings. If you have concerns about your thinking, vision or hearing, consult a qualified healthcare professional.

Questions

What is balanced accuracy?

The average of your hit rate on targets and your correct rejection rate on non-targets. It stops one strategy, like pressing every time, from looking good.

Can this tell me if I have ADHD?

No. This is an informal challenge, not a clinical test, and it cannot diagnose or rule out any condition. Talk to a qualified professional if you have concerns.

Why is response time shown separately?

Speed and accuracy can trade off. Showing them separately lets you see whether you got faster by being less careful.

More in Speed and attention · Compare all ten tests

Made and maintained by ChowChow Labs. Content last reviewed October 23, 2026. Methodology and changelog · Report a problem