Towards a unified biology of vertebrate number sense.

Genetic variation, brain lateralization, and neural circuit organization across development shape number cognition in vertebrates, with zebrafish and chicks as key models.

• Why it matters: Understanding the biological foundations of number sense is crucial because it is a fundamental cognitive ability that emerges early and is widespread across species, yet its genetic and mechanistic bases are not well integrated.
• What they did: The authors review evidence from vertebrates, focusing on how genetic differences, brain lateralization, and neural circuits influence number cognition, emphasizing zebrafish and chicks as comparative models.
• The result: This perspective highlights conserved principles and mechanisms that can advance the study of numerical cognition and its disorders from early developmental stages, opening new research avenues.