Exercises / Reaction
Go/No-Go test online, free
Respond fast to the target shape and hold back when it is not the target. Trains attention held over time and the brake on an automatic response.
Try it
Press for the target. Do nothing for anything else.
45 seconds. No account, nothing saved, nothing to install.
What does the Go/No-Go test measure?
A go/no-go task. It asks you to keep a simple response ready over a long run of trials and then withhold it on a minority of trials. It measures how often you respond when you should not (commission errors) and how often you miss a target (omission errors).
Headline measure: Median reaction time (ms)
Your score describes how you did on this task, on this day, at this difficulty. It is not an IQ score, a percentile or a medical measure. Read more on what the exercises measure.
How does the Go/No-Go test work?
Press for the target. Do nothing for anything else.
- A single shape appears in the middle of the screen.
- Press when it matches the target rule shown before the set.
- Do nothing at all when it does not match. Holding back is the harder half.
Controls
- Space / EnterRespond to a target
- TapTap the stimulus or the large button
How is the Go/No-Go test scored?
Each set reports accuracy and median reaction time. Scores compare you with your own earlier sets, never with other people.
Where does the Go/No-Go test come from?
Donders timed people responding to a signal, then timed them again when some signals had to be ignored. The difference between the two gave the first measurement of what it costs to decide not to act. Go/No-Go tasks kept that shape. You answer on the target and hold back on everything else, and the presses you should have held back, called commission errors, are the number that matters.
