This is a real research task, not a quiz and not a symptom checklist. You'll compare groups of dots and pick the side with more. It runs entirely in your browser, needs no account, and takes about four minutes.
Two groups of dots flash for a fraction of a second, too fast to count.
Pick the side with more dots. Don't count. Trust your gut.
Get an honest read on your number sense, plus what it can and can't say.
No sign-up. Nothing to install. This is a screening task for research and self-understanding, not a medical test or diagnosis.