Definition
Average visual reaction time is the typical delay between a visual stimulus and a voluntary response, usually reported in milliseconds. CognitiveBench uses a simple detection task: wait for the test area to turn green, then click, tap, or press Enter or Space. The published average is the mean of five valid rounds on that device and browser.
A commonly cited adult range for simple visual responses is about 200-250 ms. Faster or slower numbers are common. Display refresh, pointer or touch latency, fatigue, and anticipation all sit inside the same millisecond count. Treat 200-250 ms as context for a browser task, not as a clinical cutoff or a claim about intelligence.
How it is measured
CognitiveBench records both ends of the interval with performance.now(). The first timestamp is taken when the stimulus is shown as ready. The second is taken when the browser receives your input event. The stored score is the integer difference in milliseconds. Responses during the waiting phase are false starts and do not enter the five valid rounds.
That method is a browser timer, not laboratory equipment. The same person can record different averages on a phone versus a desktop. Details of randomization, false starts, and percentile caveats are on the methodology page. Use the Reaction Time Test for the interactive version of this protocol.
How to interpret an average
Prefer your own repeated sessions on one setup. A single fast round can be anticipation; a single slow round can be a glance away from the screen. Median and five-round average are more stable than a personal best. Age-band tables and device comparisons are educational, not diagnostic.
Results are for education and entertainment, not medical advice. See the Disclaimer before treating any number as a health or hiring signal. For ranges by task and age, continue with the longer average reaction time guide.
Frequently Asked Questions
What is a normal visual reaction time?
In a simple visual click task, many adults land around 200-250 milliseconds. The number includes display, browser, and input delay, so it is a session result, not a universal human constant.
How does CognitiveBench measure visual reaction time?
When the test area becomes ready (green), the page stores a high-resolution timestamp with performance.now(). When you click, tap, or press Enter or Space, a second timestamp is stored. The difference, rounded to whole milliseconds, is that round. Five valid rounds are summarized.
Is this a medical or clinical measurement?
No. CognitiveBench is for education and entertainment. A browser average is not a diagnosis, IQ score, or standardized clinical evaluation.