Disclaimer

For entertainment and self-testing only. Not a medical device and not a diagnosis of any condition, including ADHD, dyslexia, or color-vision deficiency. Consult a professional for medical concerns.

The tests on this site are simplified, browser-based reimplementations of cognitive-science paradigms. Results depend on your hardware (display, mouse, touchscreen), browser, network, and environment. They are useful for self-comparison and curiosity, not for clinical, diagnostic, employment, or academic decisions.

Percentiles are computed from a documented reference distribution and, as we accumulate data, from real results submitted to the site. We never fabricate a percentile. See the Science page for methodology.