Wait for the signal. React when GO appears. Five short rounds reveal your speed and consistency.
See each response in milliseconds and find your median after five rounds.
Good to know: Device and browser latency affect results. Early presses are separate from valid responses; this is not a clinical test.
This visual reaction speed test asks you to wait for a random GO signal, then respond with a click, tap, or key press. Complete five valid rounds to compare your median response time in milliseconds.
The result uses the median of five valid response times: the middle value after sorting them. You also see the average and fastest response. One unusually slow response has less effect on the median than on the average. The wait is randomly varied between 1.5 and 4 seconds.
The time runs from the displayed GO signal to your input handler. Screen refresh, browser scheduling, and mouse or touchscreen latency affect it. Use the same device and input to compare attempts. This browser reflex game does not provide a clinical assessment or a population ranking.
Wait until GO and the lightning symbol appear. Respond, read the time, then start the next round when you are ready. Five valid times of 240, 260, 270, 280, and 400 ms have a median of 270 ms.
If you press while the pad still says Wait, that is an early press. It is reported separately and does not become a zero-millisecond score. Retry the round; hiding the page during the signal cancels the set.