REACT OR HOLD · 20 TRIALS
Press for green GO targets. Do nothing for red NO-GO targets.
READY?
Use Space on a keyboard, or the response button on a touchscreen.
Wait for each target. Pressing before a target appears counts as a false alarm.
HOW IT WORKS
Start the test and wait through a random delay before every target.
Press Space, click, or tap as quickly as possible when the target is green.
Withhold your response when the target is red. The session ends after 20 trials.
ABOUT THE TEST
A Go/No-Go test asks you to make one response to frequent GO signals and suppress that response for NO-GO signals. It combines reaction speed with response inhibition: the ability to stop an expected action.
This online version uses green and red targets across 20 trials. GO reaction times are averaged from correct hits. Accuracy includes hits and correctly withheld responses.
READ YOUR RESULTS
You responded to a green GO target before it disappeared.
You responded to a red target or pressed before a target appeared.
You successfully withheld your response to a red NO-GO target.
FOR RECREATION
This browser test is for recreation and personal comparison only. It is not a clinical, psychological, or medical assessment and cannot diagnose attention or impulse-control conditions.
QUESTIONS
It combines response speed with response inhibition. You must react to a GO signal while withholding the same action for a NO-GO signal. This recreational test reports both timing and response accuracy.
Accuracy is the percentage of 20 trials completed correctly. A green hit and a correctly ignored red target are correct. A missed green target, response to red, or early response is incorrect.
Response inhibition is the ability to stop or withhold an action that has become expected. In this game, frequent green signals build the urge to respond, while red signals ask you to hold back.
There is no universal good score for a short browser test. Device latency, practice, attention, and testing conditions all affect results. Compare repeated sessions on the same device instead of treating one score as a health measure.
Yes. Tap the large response button for green targets and do not touch it for red targets. Compare mobile scores with other sessions on the same device because touch and keyboard latency differ.