Go/No-Go Test
Most signals say go — a green pad you should hit as fast as you can. A few say stop. The catch is that the faster you commit to reacting, the harder it is to hold back, and pressing on red is exactly the slip this test measures. It's the classic response-inhibition task from attention research, punishing both hesitation (slow reactions, missed greens) and impulsiveness (pressing on red). Runs below 90% accuracy aren't scored, so mashing every signal won't earn you a time.
No personal best yet — finish a run to set one.
Green means press — as fast as you can. Red means do nothing and let it pass. 36 signals, short random pauses between them.
How to Play
- 1.Press Start — signals appear one at a time after short random pauses.
- 2.Green means go: press Space or tap the pad as fast as you can.
- 3.Red means stop: do nothing and let it pass.
- 4.Pressing on red or missing a green counts as an error.
- 5.36 signals per run; your score is your average reaction on green.
Use this as a personal practice score
Results can vary with your device, browser, input method, and the specific round. They are useful for comparing your own runs under similar conditions, not for clinical, hiring, or diagnostic decisions. Read the methodology.
What does the Go/No-Go test actually measure?
The Go/No-Go test measures response inhibition, the part of attention that lets you hold back a response you've already started preparing. Most signals are green, so you fall into a fast rhythm of reacting. The occasional red signal asks you to do the opposite: see it, and do nothing.
Because the green trials build momentum, stopping on red is genuinely hard. That tension is the point. The test captures both how quickly you can act and how reliably you can override that action when the situation calls for restraint.
- Average go reaction time in milliseconds, showing how fast you respond when the answer is go
- Accuracy, the share of trials you handled correctly
- Commission errors, the times you pressed on a red stop signal
How to interpret a Go/No-Go score
This site has no representative population range for its thirty-six-signal browser task. Read average go response together with commission errors, missed greens, and accuracy.
The game scores a run only at 90 percent accuracy or higher. That is an internal anti-mashing rule: because twenty-seven of thirty-six signals are green, pressing on every signal would score only 75 percent. It is not a clinical or population cutoff.
How to improve your response inhibition
The most common trap is letting the green trials lull you into autopilot. If you react purely on reflex, your go time looks great but your red signals slip through as commission errors. Treat every signal as a fresh decision rather than a repeat of the last one.
Aim for a controlled response instead of your absolute fastest. A lower go time is not an improvement if commissions or omissions increase. Take breaks when errors become repetitive, and note whether they cluster late in the run without assuming a medical cause.
Frequently asked questions
What is the difference between a Go/No-Go test and a simple reaction time test?
A simple reaction time test only asks you to respond as fast as possible to every signal. A Go/No-Go test adds a stop condition: a few red signals require you to withhold your response, so it measures impulse control alongside raw speed.
What is a commission error?
A commission error is when you press on a red stop signal that you were supposed to ignore. It's the core measure of impulsivity in this task, since it shows a response that got through before you could hold it back.
Why wasn't my run scored?
Runs below 90 percent accuracy aren't scored. That threshold filters out attempts where you reacted to everything without truly distinguishing go from stop, which would otherwise produce a fast but meaningless reaction time.
Can the Go/No-Go test help measure attention and impulse control?
It is a game-style response-inhibition task for practice and self-comparison. Its result does not measure clinical attention or impulse control and should not be used diagnostically.
How can I lower my average go reaction time without making more errors?
Settle into a consistent rhythm rather than chasing your fastest possible press, and keep treating each signal as a separate decision. Speed tends to improve naturally once you stay relaxed and your accuracy is reliably high.
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