Click (or press Space) as soon as the signal appears. Your 5-trial median is compared with the adult population average. Then — honestly — we show you what this browser test cannot measure.
AXIOM — reaction test (browser)idle
Reaction time test
▶ Start
Click / press Space the moment it turns blue. Jumping the gun counts as a false start.
If you attach the result card, X hides the link card (platform rule). Pick whichever you like.
※ Rough browser measurement, for reference. Feel free to edit the copied text before posting.
Your 5 trials, decomposed
Speed—median = μ (your anchor)
Stability—scatter = σ (width of the wobble)
Attention lapses—largest delay = τ (the moment attention slipped)
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※ Five trials give a rough sketch. AXIOM decomposes dozens of trials with a proper Ex-Gaussian fit (μ/σ/τ) and compares them with "your usual" (method lineage: PVT — Dinges & Powell 1985). definitions →
Your history — this browser only
※ This is the simplified version. AXIOM decomposes dozens of trials into μ/σ/τ and statistically estimates "your usual". Your history is stored only in this browser (localStorage) and is never transmitted.
So… is this number "good"?
Comparing with everyone tells you only half the story.
What you just learned is your position among adults in general. But what matters at decision time is "is this the usual you?" You can rank high in the population and still be slower than your own usual — a day to be careful. The reverse happens too — and the two do not coincide.
This test = population comparison
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Your position among adults in general. = tells you whether you are a fast person — and stops there.
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AXIOM = your own usual Standard+
Speed —ms—
e.g. your usual 260–380ms (±2σ)
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※ The "usual range" here is illustrative. The real AXIOM derives your own range from your past measurements via μ/σ/τ — the yardstick is you, not the population.
What this test can and cannot tell you
The numbers above are rough guides. Browser timing has inherent limits — and what AXIOM measures right before your decisions starts where this test ends.
Limits of browser timing
The exact instant the signal hit the screen is unknowable. Between the draw call and the pixels lighting up lie 1–2 frames (~16–33ms) of uncertainty that cannot be measured from here.
Dropped frames and bad environments go undetected. Stutter, remote desktops, virtual machines, refresh rates — indistinguishable, so bad conditions produce the same-looking numbers.
One number, one shot. Fast or slow — that is all. No breakdown (stability, lapses), no comparison with "your usual".
What AXIOM adds
Raw input timing + presentation polling. Measured against OS-level raw input (QPC) and the frame the stimulus was actually presented. Browser-style measurement (= this very test) gets excluded by its quality gate.
Dropped-frame exclusion + environment verification. Janky trials are dropped; remote/virtual environments are detected. Bad-condition measurements are not used.
μ/σ/τ decomposition + comparison with your usual. Speed, stability, and attention lapses — your drift from your own baseline, right before the decision.
※ AXIOM displays raw measured values in observational language. No latency correction or precision calibration is applied (software proxy timestamps). This test is a rough reference and guarantees no medical judgment or outcome.
Your drift from "usual you" — right before the decision.
This test stops at the population average. AXIOM compares you with your own usual and shows the breakdown (μ/σ/τ).
Before the big trade · during the tournament break · before the key meeting — those few minutes. Windows / 1–3 min / data stays on your device. English UI included.
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Reaction time is the interval between a stimulus (here, the screen changing color) and your response (a click or key press). As a behavioral indicator of alertness and attention, it has been used in sleep research and fatigue assessment for over 40 years. This test is a simplified browser version of the standard method, the PVT (Psychomotor Vigilance Test, Dinges & Powell 1985).
What is the average reaction time?
In calibrated large-scale testing, mean simple reaction time in healthy adults is about 231ms (about 213ms after hardware-delay correction; N=1469, ages 18-65; Woods et al. 2015). As that study shows, reaction times vary substantially across labs and devices, partly due to equipment timing delays. The "population position" on this test is a rough guide based on a schematic reference distribution (center 309ms, SD 106ms) that allows for such uncorrected-device variance. It is not a normative dataset.
How would you measure it accurately? (The browser's limits)
Browser measurement has inherent limits — the exact on-screen moment of the stimulus cannot be pinpointed (1–2 frames, ~16–33ms of uncertainty), and dropped frames or remote/virtual environments cannot be detected. We disclose the details in "what this test can and cannot tell you" below your results. These numbers are rough references and not for diagnosis or treatment.
What appears when you keep measuring?
The information lives less in any single number than in the difference from your own usual. Beyond the median (speed), changes in scatter (σ) and large delays (τ) are clues to your attentional state. This test is a 5-trial sketch; the AXIOM desktop app decomposes dozens of trials with an Ex-Gaussian fit (μ/σ/τ) and compares them against your personal baseline.
References: Dinges, D. F., & Powell, J. W. (1985). Behavior Research Methods, Instruments, & Computers / Woods, D. L., et al. (2015). Frontiers in Human Neuroscience
Population comparison = schematic reference distribution (center 309ms / SD 106ms) that allows for cross-device variance. For calibrated measurements see Woods et al. (2015).
This is a browser-based reference measurement. Values are rough guides — not for diagnosis, treatment, or outcome guarantees.
Your history is stored only in this browser (localStorage) and never transmitted automatically. Sharing happens only when you do it. ← Back to AXIOM (EN) · 日本語版