Babies' innate number sense traced to brain activity
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- Marco Buiatti of the University of Trento fitted 21 newborns (0–3 days old) with EEG caps and played recordings of 4 or 12 repeated syllables while showing matching or mismatched dot patterns.
- The parietotemporal area showed decreased electrical activity when numbers matched and increased activity when they didn't—the first evidence of repetition suppression in newborns, a mechanism previously only confirmed in adults.
- Brian Butterworth at University College London, not involved in the study, compared innate number sense to perceiving color without reasoning: "just like seeing the world in colour, for most people."
- The study, posted on bioRxiv (DOI: 10.64898/2026.05.08.723896), is the first to show a neural mechanism for the innate sense of number, according to Buiatti.
- Buiatti noted a child's number sense at 1 year old already predicts later maths skills, and decoding the mechanism could enable an early neural biomarker for dyscalculia, a learning difficulty that affects understanding and use of numerical information.
- Rapidly distinguishing one from many likely gave early humans a survival edge when assessing predator or food quantity, the researchers argue.
Why it matters: Pinpointing the neural signature of number sense within days of birth gives researchers a concrete path toward an early biomarker for dyscalculia, a learning difficulty that currently can only be flagged years later when children struggle with math. The lead team includes dyscalculia screening among the work's long-term aims.
