Reaction Time Knowledge Hub

Fundamentals

What reaction time is, how it works, what numbers actually mean.

Gaming

Reaction time for FPS, MOBA, fighting, racing and rhythm games.

Age & Biology

How reaction time changes across life stages, sex and lifestyle.

Training

Drills, routines and lifestyle factors that actually move the number.

Measurement

How tests work, sources of error, hardware and methodology.

All Articles

• What Is Reaction Time? — Reaction time is the gap between a stimulus and your response. Here is what the number actually represents, in everyday language.
• Simple vs Choice Reaction Time — Simple reaction time uses one stimulus and one response. Choice reaction time adds decisions. Here is why the second number is always slower.
• What Is the Fastest Possible Human Reaction Time? — The biological floor of human reaction time is roughly 100 ms for sound and 150 ms for vision. Anything faster is anticipation, not reaction.
• Why Your Reaction Time Varies Every Attempt — Single attempts swing by 40–80 ms because attention, breathing and neural noise change second to second. Here is how to measure the real number.
• Reaction Time vs Reflex — Reflexes bypass the brain through the spinal cord. Reaction time always involves conscious processing. Mixing them up causes most training mistakes.
• Reaction Time for FPS Games — Tactical FPS rewards 180–230 ms reactions; arena shooters reward 150–200 ms. Here is what each genre actually demands and how to test yours.
• Reaction Time for MOBA Games — MOBA combat rewards decision speed more than raw reaction. League and Dota duels run at 250–400 ms reaction windows. Here is how to use that.
• Reaction Time for Fighting Games — Fighting games measure reaction in frames. A 16-frame reactable move at 60 fps is 266 ms — within the reach of average reactions with training.
• Reaction Time for Racing Games — Racing reaction time is the gap between visual cue and corrective input. Sim racing rewards 200–260 ms; arcade racers tolerate 280+ ms.
• Reaction Time for Rhythm Games — Rhythm games measure timing precision, not reaction. The good players see the note 600+ ms ahead and execute on the beat, not in response.
• How Reaction Time Changes with Age — Reaction time peaks at 24, plateaus to 35, then slowly increases. Here is the year-by-year curve with the biology behind each phase.
• Reaction Time in Teenagers — Teenagers are fast but not yet at adult peak. Myelination finishes in the early twenties, which is why 16-year-old esports prodigies still improve into their twenties.
• Reaction Time in Seniors — After 60 reaction time slows by about 2 ms per year. Targeted drills can recover 40–60 ms in older adults, often within a month.
• Reaction Time and Sex Differences — Studies consistently find men averaging 10–25 ms faster than women on simple reaction tests. The gap shrinks under training and disappears on complex tasks.
• Reaction Time in Children — Children's reaction time starts around 380 ms at age 5 and improves rapidly through age 12. Here is the developmental curve and what drives it.
• Reaction Time Training Drills — Five evidence-backed drills that improve reaction time by 30–60 ms in two weeks. No equipment, 10 minutes per day.
• How Caffeine Affects Reaction Time — Caffeine improves reaction by 15–35 ms at 100–200 mg, peaking 30–60 minutes after ingestion. Above 300 mg the gain disappears under jitter.
• Reaction Time and Sleep — A single night of 5 hours sleep adds 40–80 ms to your reaction time. Chronic short sleep adds 100–150 ms. No other variable matches its impact.
• Reaction Time and Fatigue — Reaction degrades after 25–40 minutes of focused play. The cause is attention fatigue, not muscle tiredness. Short breaks fully restore baseline.
• How Long Does It Take to Improve Reaction Time? — Visible gains appear in 1–2 weeks, biological adaptation takes 4–6, and plateau near your personal floor takes 8–12. Here is what to expect at each stage.
• How Reaction Time Tests Actually Work — Inside a reaction test: random stimulus delay, monitor-synced rendering, JavaScript event timing. Here is what makes a measurement trustworthy.
• Monitor Refresh Rate and Reaction Time — A 60 Hz monitor adds up to 16 ms of delay per cue. A 144 Hz monitor reduces it to 7 ms. The full impact is bigger than most players realise.
• Mouse Polling Rate and Reaction Time — A 125 Hz mouse adds up to 8 ms of input delay. A 1000 Hz mouse cuts that to 1 ms. Higher polling rates have diminishing returns past 2000 Hz.
• Browser vs Native App Reaction Tests — Modern browsers measure reaction within 5–10 ms of native apps. The remaining gap comes from compositor latency and JavaScript scheduling.
• How to Detect Cheating on Reaction Tests — Reaction-test cheating leaves fingerprints: sub-floor times, low variance, suspiciously round numbers, and timing-source inconsistency.
• Average Reaction Time By Country — How average human reaction time differs across countries, what explains the gap, and where the numbers are unreliable.
• Why Pro Gamers Have Faster Reaction Time — The real reasons elite esports players post 150–180 ms — and how much of it is trainable versus selection bias.
• Are You Born With Your Reaction Time? — Twin and family studies on the heritability of reaction time, what genes are implicated, and what is left to training.
• Reaction Time And IQ — How strongly does reaction time correlate with intelligence? The peer-reviewed answer is smaller than you have heard.
• Auditory vs Visual Reaction Time — Sound is processed faster than light by the brain. Here is exactly how much faster, and why it matters for sports and gaming.
• Reaction Time And ADHD — ADHD does not slow mean reaction time much — but it dramatically increases variability. Here is what that means.
• Alcohol And Reaction Time — How much does alcohol actually slow reaction time? Dose-response data from controlled studies.
• Nicotine And Reaction Time — Nicotine briefly speeds reaction time, but chronic use damages it. The peer-reviewed data, plainly.
• Exercise And Reaction Time — How light exercise sharpens reaction time within minutes, and how chronic fitness raises your ceiling.
• Meditation And Reaction Time — Meditation does not make you faster — it makes you more consistent. Here is the precise effect.
• Cold Exposure And Reaction Time — Cold showers, ice baths and ambient cool — what they actually do to reaction time.
• Hydration And Reaction Time — Mild dehydration slows reaction time more than people realize. The threshold and recovery, by the numbers.
• Blood Sugar And Reaction Time — Low blood glucose slows reaction time fast. The exact threshold and what to eat before a session.
• Peripheral Vision And Reaction Time — Why your peripheral RT is faster than your foveal RT, and what that means for gaming setups.
• Tennis Reaction Time — How elite tennis players return 200 km/h serves with 400 ms of flight time. The anticipation science behind it.
• Boxing Reaction Time — Boxers slip 250 ms punches with 230 ms reactions. How the brain compresses the gap.
• Formula 1 Reaction Time — F1 drivers post 150–200 ms light reactions. How they do it and what it tells us about human limits.
• Goalkeeper Reaction Time — How goalkeepers save penalties when the ball arrives in 400 ms — and what it tells us about reaction time.
• Baseball Reaction Time — A 95 mph fastball arrives in 400 ms. Mean human reaction is 220 ms. Here is how MLB hitters do it.
• Reaction Times Of Esports Professionals — Published and tournament-measured reaction times of pros in CS2, Valorant, Apex, League and StarCraft.
• Why Mobile Reaction Time Is Slower — Touch input on phones adds 30–80 ms of measured reaction time. Here is exactly where it comes from.
• Wireless vs Wired Mouse — Reaction Time — Modern wireless mice are essentially as fast as wired. The measured gap, and the exceptions.
• Bluetooth vs USB Input Lag — Bluetooth peripherals lag USB ones by 8–25 ms. Why, and which connections are exceptions.
• OLED vs LCD Reaction Time — OLED panels respond in microseconds; LCDs in milliseconds. The real-world difference for gaming and testing.
• Controller vs Keyboard — Reaction Time — Keyboards beat controllers by 20–50 ms on most reaction tests. The reasons and the exceptions.
• Reaction Time Percentiles Explained — What it means to be "in the 90th percentile" for reaction time, and how to interpret your score honestly.
• How To Warm Up Before A Reaction Time Test — A 5-minute warm-up routine that consistently improves test scores by 15–30 ms.
• Music And Reaction Time — How background music affects reaction time: tempo, lyrics, volume and personal preference all matter.
• Preventing Reaction Time Decline With Age — Reaction time declines 0.5–1 ms per year after 25. Five evidence-based interventions that slow the curve.
• Menstrual Cycle And Reaction Time — Hormonal phase affects reaction time by 10–25 ms across the menstrual cycle. The published evidence.