The Science

Every test here is a browser reimplementation of an established cognitive-science paradigm. We tell you what each one measures, where the numbers come from, and how your percentile is calculated — because a percentile you can’t trust is worthless.

How percentiles work

At launch, each test ships a reference distribution derived from published research (for example, simple reaction time has a median of roughly 273–284 ms with a hard human floor near 120 ms). Your percentile is your position on that curve.

As real, anti-cheat-validated results come in, we blend the reference curve with our own accumulated data, weighted by sample size, until the live data dominates. We always show the sample size so you know how solid the number is. We never round up dishonestly and never invent a “top 1%.”

The paradigms

• Reaction Time — simple visual reaction time (SRT).
• Sequence Memory — Corsi-style spatial working memory.
• Number Memory — digit span (Miller’s 7±2, 1956).
• Aim Trainer — motor targeting (Fitts’ Law).
• Chimp Test — Inoue & Matsuzawa spatial memory (Current Biology, 2007).

Full citations and per-test methodology are being expanded here.