反射神経・反応速度テスト。

The median human visual reaction time is around 250–273 milliseconds. Scores under 200 ms are considered fast (typical of competitive gamers and athletes), while reaction times under 170 ms are in the top tier of human reflex speed.

When you click to start, the test enters a waiting state with a randomized delay between 1.5 and 4.0 seconds. As soon as the screen flashes green, a high-resolution timer (performance.now()) starts and measures the exact milliseconds until your click or keypress registers.

A single trial is susceptible to anticipation errors or momentary lapses in attention. Averaging 5 consecutive trials smooths out statistical noise and provides an honest, reliable measurement of your true visual response latency.

Yes. Hardware latency matters: standard 60Hz monitors add roughly 16.6ms of frame delay compared to ~4.1ms on a 240Hz gaming display. Wireless interference, TV processing lag, and deep-travel keyboard switches can also add 10–50ms to your measured score.

Yes. While biological reflex ceilings exist, deliberate focus drills, consistent sleep, hydration, and gaming practice can reduce response latency by 15–40 ms by optimizing visual stimulus recognition and neuromuscular priming.