Two groups of dots (yellow on left, blue on right) will flash briefly
Dots disappear after 400ms
WAIT for dots to disappear and buttons to appear before answering
Click YELLOW button (or press ← / A) if yellow had more dots
Click BLUE button (or press → / D) if blue had more dots
You have 2-5 seconds to respond (set in options) - answer quickly!
Get instant feedback (correct, incorrect, too slow, or too early)
Continue for all trials to complete the session
About Number Sense & Dyscalculia Screening:
Number Sense (ANS) is your brain's Approximate Number System - the ability to quickly judge quantities without counting
This magnitude comparison test uses the Panamath research protocol with 400ms display time
You cannot count individual dots in 400ms - you must use magnitude estimation
This measures your intuitive sense of "more vs less" for visual quantities
Dyscalculia Screening: Poor performance on magnitude comparison tasks is a key indicator of dyscalculia, a learning disorder affecting number sense. This test helps identify potential difficulties with numerical processing.
Weber Fraction: Your accuracy reflects your ANS precision - the smaller the difference you can detect, the better your number sense
Note: This is an educational screening tool for training and self-assessment. It is not a diagnostic test. Consult a qualified professional for formal evaluation of dyscalculia or learning difficulties.
Difficulty levels:
Easy: Large difference between quantities (e.g., 5 vs 10) - ratio ~1:2
Medium: Moderate difference (e.g., 7 vs 10) - ratio ~2:3
Hard: Small difference (e.g., 9 vs 10) - ratio ~9:10
Tips for improvement:
Don't try to count - trust your gut impression of which side has "more"
Focus on the overall density/coverage rather than individual dots
Practice regularly — number sense acuity improves with training
Start with Easy to build confidence, then increase difficulty