Test de vitesse de traitement

Ce que ça mesure

How quickly and accurately your brain takes in simple visual information and acts on it — what psychologists call processing speed. You match symbols to their paired digits as fast as you can for just over a minute; the count of correct matches per minute is the headline number, alongside your accuracy and average response time.

Comment ça marche

This is a screen version of a symbol-digit substitution task, the same idea behind the widely used Symbol Digit Modalities Test (SDMT) and the digit-symbol coding subtests in the Wechsler scales. A key pairs nine abstract symbols with the digits 1 to 9 and stays on screen the whole time. One symbol appears large in the middle; you enter its matching digit using the on-screen keypad or your number keys. Correct answers move you on to the next symbol; the clock runs for 75 seconds. We then convert your correct substitutions into an items-per-minute rate and report your accuracy and mean response time.

Conseils pour un résultat fiable

• 1Glance, do not stare — Keep the key in your peripheral vision and let your eyes flick to it only when you are unsure — fluent runs lean less on the key over time.
• 2Keep conditions identical — If you want to compare runs, test at the same time of day, on the same device, equally rested. Otherwise you are measuring the day, not your speed.
• 3Expect a practice bump — Almost everyone speeds up over the first few attempts as the symbols become familiar. Treat your first run as a warm-up, not a baseline.
• 4Mind caffeine and sleep — Stimulants and a good night's sleep can lift processing speed noticeably, while tiredness, alcohol, and some medications slow it — note your state when you test.