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Scientists find why marmoset brains stay small and smooth

ScienceDaily 22 October 2026 1 min read

In short

  • Common marmosets have small, smooth brains even though they start development like other primates.
  • The difference comes from subtle changes in brain-building cells that slow neuron production.
  • The findings may help explain how the large, folded human brain evolved.

Why the Good News Desk likes this one

The study points to a specific change in brain-building cells that slows neuron production. It gives researchers a clearer way to ask how the folded human brain came to be. This is basic research, so it does not yet point to a treatment.

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From ScienceDaily

Scientists have discovered why common marmosets have unusually small, smooth brains despite starting development much like other primates. The secret lies in subtle changes to brain-building cells that slow neuron production, revealing new clues about how the large, folded human brain evolved.

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For kids

Scientists studied tiny monkeys called marmosets. They found that small changes in special brain-building cells make their brains small and smooth. This helps us learn how human brains became big and wrinkled over a very long time. Talk about it: why do you think our brains have so many folds?

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