Select a difficulty, response time limit, and number of trials.
Click START TEST. You will first complete 2 unscored practice trials using the same timing and controls as the scored test.
A fixation cross appears before each brief dot display so you know where to focus.
After the dots disappear, choose Yellow if the left side had more dots or Blue if the right side had more.
You can click the buttons or use ← / A for Yellow and → / D for Blue.
Answer before your selected response time limit expires.
Complete all trials to receive your accuracy and average response time.
About Number Sense & the Approximate Number System:
Approximate Number System (ANS): the ability to make fast, approximate judgments about which of two quantities is larger without counting each item.
This test uses brief nonsymbolic dot comparisons, a common format for studying approximate quantity discrimination.
Dot sizes vary across trials so that total colored area is not always a reliable shortcut for choosing the more numerous side.
Magnitude perception: closer quantities are harder to distinguish than quantities with a large numerical difference.
Your result reports accuracy and response time for the selected difficulty. It does not calculate a clinical or research-grade Weber fraction.
Difficulty levels:
Easy: large quantity differences, roughly 1:2 to 3:5.
Medium: moderate quantity differences, roughly 2:3 to 3:4.
Hard: similar quantities, roughly 4:5 to 9:10.
Tips:
Do not count individual dots; respond from the overall quantity impression.
Repeat the same settings when you want to compare your own performance over time.
Start with Easy if the brief display feels too difficult, then move up.
Looking for a questionnaire-based dyscalculia screening instead? Take the Dyscalculia Test. This number sense test is a performance exercise and does not diagnose dyscalculia or another learning disorder.