speech sounds article

i like this article from Science Daily titled, "Native Language Governs The Way Toddlers Interpret Speech Sounds". here are the good parts:

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This is the first time scientists have shown that children as young as 18 months actively interpret the phonetic characteristics of their particular language when they learn words. Previously, scientists had speculated that this ability would emerge much later in life, once children had already amassed large vocabularies.

Previous research showed that at birth infants can distinguish most of the phonetic contrasts used by all the world's languages. This ''universal'' capacity shifts over the first year to a language-specific pattern in which infants retain or improve categorization of native-language sounds but fail to discriminate many non-native sounds. Eventually, they learn to ignore subtle speech distinctions that their language does not use.

This is why Japanese toddlers, like Japanese adults, cannot tell apart the English "r" and "l" sounds and why English speakers have trouble with certain French vowels because they all sound the same to non-native speakers due to language learning in infancy. The Penn study shows that even when two words sound very different, toddlers know whether to take this difference seriously or to chalk it up to random variation depending on how their language works.

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