The FAQ below covers the basics of reaction speed, common performance factors, gaming, hardware and testing accuracy. For a deeper explanation, use the linked Guides hub after the answers.
Reaction time is the interval between a defined stimulus and a measurable response. In a browser test, the recorded interval also includes display, input-device and software timing.
There is no universal cutoff. Simple visual adult reaction times are often in the low-to-mid hundreds of milliseconds in laboratory studies, while online scores vary with hardware and task design.
It is a quick simple visual browser result for many adults, especially if it is a repeatable median or average rather than one lucky best trial.
Very short responses can occur in specialized or highly anticipated tasks, but sub-100 ms browser clicks should be interpreted cautiously because anticipation and hardware timing become important.
Attention, preparation, motor timing, anticipation and system timing fluctuate. A distribution of different trial times is normal.
For typical performance, median or average across several valid trials is more informative. Keep the best as a secondary personal-best stat.
For casual tracking, several practice trials followed by roughly 5–10 recorded trials is a useful routine. More trials improve stability.
On average, reaction time changes across adulthood, but age is only one factor and people of the same age can differ substantially.
Yes. Sleep-deprivation research shows poorer psychomotor vigilance, including slower responses and more lapses.
Randomized meta-analytic evidence suggests a small average improvement in reaction time and attention performance, but individual effects vary.
Acute exercise meta-analyses report small cognitive benefits in some conditions, including reaction-speed measures, but results depend on intensity and timing.
Some research on action-game players and training finds advantages on selected speed/attention tasks, while other meta-analyses caution that broad transfer is limited.
Often in simple laboratory comparisons, but not always. Stimulus design and hardware can change the difference.
Not in the physiological sense. A reflex is automatic; an online reaction test usually measures a voluntary sensorimotor response.
It is a task where more than one response is possible and you must identify the stimulus before selecting the correct action.
It requires a response to go signals and withholding the response to no-go signals, combining speed with inhibition.
You may anticipate the signal and begin responding before it appears. Random delays and penalties reduce this strategy.
It can affect when a visual update becomes visible. Higher refresh rates shorten frame intervals, but total latency also includes panel, input and software delays.
It can affect the wait until the next mouse report. Higher polling reduces the report interval but is only one part of total input latency.
Not directly when the game timer runs locally. Ping measures network round-trip time; Reaction Lab’s core response timing happens on your device.
Different displays, touch/mouse input paths, refresh rates and movement mechanics can shift the recorded result.
It can be consistent enough for personal comparisons, but consumer hardware prevents it from being a perfectly calibrated measurement of biological reaction time.
Practice can improve performance on the practised task, while sleep, attention and other factors also influence performance. Transfer to unrelated tasks is not guaranteed.
Aim includes reaction, movement time and accuracy. It should not be interpreted as the same metric as a stationary simple reaction test.
No. Reaction Lab is an entertainment and personal benchmarking site, not a medical, vision, hearing, neurological or driving-safety diagnostic tool.