Stop
The pymetrics (Harver) Stop game is a rapid go/no-go task—not a stop-signal task. You respond to red circles and withhold on green circles while repeated go trials build response momentum.
How to Play
Press the spacebar when a RED circle appears. Do nothing when a GREEN circle appears.
Every red circle also has stripes and a P; every green circle has dots and an H, so the rule never depends on color alone.
Each circle lasts briefly. A missed red and a press on green both count as errors.
On a touch device, use the full-width TAP FOR RED / P button in place of the spacebar.
In the real assessment
The real assessment is generally described as showing no right/wrong feedback. This practice version flashes a subtle ✓ or ✕ after each circle; the exact real trial count remains unconfirmed.
Skills Assessed
Pro Tip!
Want to master this game? Read our expert guide for winning strategies and insights.
Read the Stop Guide →GameAssessmentPrep is an independent practice platform. We are not affiliated with pymetrics, Harver, or any employer. Our simulations are reconstructions for practice purposes.