What the Reaction Time Test Measures
The timer begins when the page changes the visual signal and stops when your response event reaches the page. The result combines your reaction with display, input and browser scheduling effects.
A randomized waiting period discourages guessing; an early response restarts the round.
How to Use the Reaction Time Test
- 1Choose Start and watch the test area.
- 2Wait for the ready signal before clicking or pressing the response key.
- 3Complete five valid trials.
- 4Compare the average or median across repeated sessions on the same setup.
How to Interpret the Result
Lower values indicate a faster measured response in this setup, but one best trial can be an outlier. Compare several runs under similar conditions.
A Too Soon result means you responded before the signal, so that trial is not counted.
Making Reaction Runs Comparable
Use five valid trials and consider both average and median rather than choosing the single fastest result. Keep the same input method, display and browser when comparing sessions. Distractions, anticipation and fatigue can change a human response from one round to the next.
This page begins timing when its visual ready state is set and stops when the response reaches the browser. It does not separate human perception, display presentation, mouse switch behavior and browser scheduling. An early click restarts the round and a hidden tab invalidates it.
Browser Limitations
This is not a measure of human neural reaction alone or full device latency. Display timing and browser scheduling affect the observed interval. Switching tabs invalidates the active trial.