Go/No-Go Reaction Test
React to green GO signals. Hold back on red NO-GO signals. Tests both your reaction speed and your ability to suppress impulsive responses.
Click or press Space only when you see GO. Ignore NO-GO. 20 trials, no sign-up needed.
What Is the Go/No-Go Test?
The Go/No-Go test is one of the most widely used paradigms in cognitive neuroscience and psychology. Unlike a simple reaction time test where you always respond, the Go/No-Go test requires you to selectively respond — reacting quickly to one stimulus (GO) while actively suppressing your response to another (NO-GO).
This distinction is critical: the test measures not just how fast you are, but how well you can control impulses. Two people with identical raw reaction times can produce very different Go/No-Go profiles depending on their inhibitory control — the cognitive ability to stop a prepotent (automatic) response.
The test was developed in the 1970s and has since been used in thousands of clinical and research studies examining attention, impulse control, ADHD, substance use, and executive function. It remains one of the simplest and most reliable measures of response inhibition available.
Understanding Your Metrics
Reaction Speed (Go RT)
The average time between the GO signal appearing and your click. This measures raw processing speed on trials where a response is required. Typical adults average 200–300 ms; athletes and frequent test-takers often achieve 180–240 ms.
Go Accuracy
The percentage of GO signals you correctly responded to. Missing GO signals (a miss) usually indicates inattention, over-caution, or fatigue. A well-rested, focused adult should achieve 90–100% Go accuracy.
No-Go Accuracy & False Alarms
The percentage of NO-GO signals you correctly did not respond to. A false alarm is clicking when you should have held back — the key marker of poor impulse inhibition. Healthy adults average 10–20% false alarm rates on fast-paced versions of this test. Rates above 30% suggest impulsive responding. The goal is not zero false alarms (that often means you are going too slowly) but a balance between speed and accuracy.
Inhibition Score
A composite metric combining No-Go accuracy and false alarm rate into a single 0–100 score. Higher scores indicate stronger inhibitory control. This is distinct from reaction speed — you can be fast and still have a poor inhibition score if you frequently false-alarm on NO-GO signals.
Why Inhibitory Control Matters
Everyday Decision-Making
Inhibitory control underpins a wide range of everyday behaviours: stopping at a red light, not checking your phone mid-conversation, resisting an impulsive purchase. People with stronger inhibitory control consistently show better outcomes in academic performance, financial decision-making, and health behaviours. The Go/No-Go test captures a measurable slice of this ability.
Sports and Reaction Under Pressure
In competitive sports, inhibitory control is as important as raw speed. A basketball player who drives every time they receive the ball is predictable. A tennis player who swings at every wide ball loses points. The ability to distinguish which stimuli demand a response — and which require restraint — separates good athletes from great ones.
Clinical Significance
The Go/No-Go task is a validated clinical tool used to assess conditions associated with impulsivity, including ADHD, substance use disorders, and certain anxiety disorders. Individuals with ADHD typically show higher false alarm rates and greater variability in reaction times — not slower reaction speeds overall, but impaired response inhibition. This test is for recreational self-assessment only and does not constitute a clinical evaluation.
How to Improve Your Go/No-Go Performance
Unlike pure reaction speed, inhibitory control shows strong plasticity — it can be meaningfully improved through training. The key is not slowing down your GO responses to avoid false alarms, but developing the ability to respond fast and hold back when needed simultaneously.
- Practice the test regularly. Even brief daily sessions (5–10 minutes) build the neural pathways involved in response inhibition. Treat it as a focused cognitive drill, not a casual game.
- Prioritize accuracy over speed. If your false alarm rate is above 20%, deliberately slow your response slightly. Once accuracy improves, speed naturally follows.
- Sleep and cognitive load matter. Inhibitory control is among the first cognitive functions impaired by sleep deprivation. Testing after a poor night's sleep reliably produces more false alarms. Fatigue and stress both reduce No-Go accuracy significantly.
- Mindfulness training. Multiple studies show that regular mindfulness practice — as little as 10 minutes per day over 8 weeks — produces measurable improvements in Go/No-Go performance, particularly in reducing false alarms.