What is a go/no-go task?
You see a rapid stream of stimuli. Most are go trials — respond as fast as you can. A minority are no-go trials — do nothing. Because go trials are frequent, responding becomes automatic, and the no-go trials test whether you can cancel a response you were already preparing. Researchers use versions of this task to study response inhibition; the game above is a simplified, non-clinical version.
How to read your results
- Commission errors — tapping on a no-go trial. This is the headline “did you stop?” measure.
- Omission errors — missing a go trial (or tapping so early it can’t have been a reaction). Many omissions usually mean attention drifted.
- Median reaction time — how fast you were on correct go trials. The median ignores the odd very slow tap.
- Reaction-time variation — the standard deviation divided by the mean. Lower means steadier timing, independent of raw speed.
The speed–accuracy trade-off
Going faster almost always means tapping more decoys. That’s why a good go/no-go score is never just a fast reaction time. Try one round aiming for speed and one aiming for zero commission errors — the difference is the trade-off in action.
What affects reaction-time measurements?
- Display refresh rate and browser rendering (roughly 8–17 ms of uncertainty on typical screens).
- Input type: touchscreens, mice and keyboards each add different latency.
- Your state: sleep, fatigue, caffeine and time of day.
- Familiarity: most people improve on the second and third attempt.
Frequently asked questions
What is a go/no-go task?
A go/no-go task shows a stream of stimuli. For the frequent 'go' stimulus you respond as fast as you can; for the rarer 'no-go' stimulus you must withhold the response. Because responding becomes a habit, the no-go trials measure how well you can stop a prepared action.
What do go/no-go results show?
Two things mainly: errors of commission (responding on a no-go trial) and errors of omission (missing a go trial), plus reaction time on correct go trials. Faster responses usually come with more commission errors — the classic speed–accuracy trade-off.
Is a browser go/no-go game a diagnostic test?
No. Clinical and research versions use controlled hardware, standardized instructions and normative data. A browser game is affected by screen refresh rate, input lag and your device. Treat the result as a personal practice score.
Want a daily version? Play the Daily Signal — the same format in 20 seconds, with one shared pattern per date.