VIGILANCE · 5 TRIALS
Wait through an unpredictable delay. Respond the instant the green timing signal appears.
Complete five trials. False starts and timeouts count, then the test continues.
READY?
The signal delay changes every trial. Do not try to predict it.
Press Space or use the large response pad. Input while WAIT is shown is a false start.
HOW TO PLAY
Start a trial and keep your finger ready while the pad says WAIT.
The waiting animation loops continuously and does not reveal when the signal will appear.
When the pad turns green, press Space or click or tap as quickly as possible.
SUSTAINED ATTENTION
You maintain attention through an unpredictable wait, avoid responding early, and react when the visual signal finally appears.
The five-trial format is intentionally short for casual play. Display refresh rate, input hardware, browser scheduling, practice, and distraction can all change a result.
RECREATIONAL USE ONLY
This browser game is for entertainment and personal practice. It is not a validated clinical PVT and cannot diagnose sleep loss, impairment, or any health condition.
Do not use this result for medical, safety-critical, employment, driving, or fitness-for-duty decisions.
READ YOUR RESULT
Median is the middle correct response after sorting your times. Average uses every correct response, and fastest is your lowest correct time.
LAPSES
For this game, a correct response above 500 ms or a timeout counts as a lapse. This threshold is only a gameplay statistic, not a clinical interpretation.
QUESTIONS
Wait while the pad says WAIT, then press Space or click or tap as soon as the green signal appears.
Any response before the green signal appears is a false start. Standard mode continues; endless mode ends immediately.
It confirms the game is active without revealing the randomly selected signal time.
No. It is a short recreational browser game, not a clinical or diagnostic measurement.