Arena — Snap Decision
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Choice reaction — click the lit zone (Hick / info rate). Reaction time uses the pointer event.timeStamp correlated to stimulus onset; the seed-derived run is re-scored server-side. Same-setup — not a lab-grade replacement for the tests.
The science, playfully
Hick–Hyman law · choice reactionThe science behind it
Reacting to one cue is a reflex; choosing between several is a decision, and choice reaction time grows with the log of the number of options (the Hick–Hyman law). Varying how many options are live exposes how much each extra choice costs you.
Reading your score
The ranked number folds speed and correctness together, so fast-but-wrong tanks it. The same trials also drive a drift-rate readout that separates raw decision ability from how cautious you are playing.
The honest limits
This is not pure brain speed — your monitor, mouse, and the browser clock are all inside the number, the same ± as the reaction test. Give it enough trials before trusting the readouts.
Per-action telemetry (stimulus onset, response event.timeStamp, sub-frame cursor path for aim modes, per-trial responses for decision modes) is re-derived from the seed and re-scored on the server. Ranks are provisional in beta.