Korean language

Language heard, but never spoken, by young babies bestows a hidden benefit

mother and baby laughing and playing
Babies who heard Korean spoken in their first six months of life were better able to pick up the language later as adults, a study finds. The results show how early language exposure patterns the brain in ways that may not be revealed for decades, if ever.

The way babies learn to speak is nothing short of breathtaking. Their brains are learning the differences between sounds, rehearsing mouth movements and mastering vocabulary by putting words into meaningful context. It’s a lot to fit in between naps and diaper changes.

A recent study shows just how durable this early language learning is. Dutch-speaking adults who were adopted from South Korea as preverbal babies held on to latent Korean language skills, researchers report online January 18 in Royal Society Open Science. In the first months of their lives, these people had already laid down the foundation for speaking Korean — a foundation that persisted for decades undetected, only revealing itself later in careful laboratory tests.

Researchers tested how well people could learn to identify and speak tricky Korean sounds. “For Korean listeners, these sounds are easy to distinguish, but for second-language…