Reading
Spoken language: the foundation of reading

Spoken language is the foundation of learning to read (long before children see any letters) and children's knowledge of the phonological structure of language is a good predictor of early reading ability. Spoken language is dominant for most of childhood; however, reading ultimately catches up and surpasses speech.

By their first birthday most children have learned all the sounds in their spoken language. However, it takes longer for them to learn the phonological form of words and to begin developing a spoken vocabulary.

Children acquire a spoken language in a few years. Five-to-six-year-old English learners have vocabularies of 2,500 to 5,000 words, and add 5,000 words per year for the first several years of schooling. This rapid learning rate cannot be accounted for by the instruction they receive. Instead, children learn that the meaning of a new word can be inferred because it occurs in the same context as familiar words (e.g., lion is often seen with cowardly and king). As British linguist John Rupert Firth says, "You shall know a word by the company it keeps".

The environment in which children live may also impact their ability to acquire reading skills. Children who are regularly exposed to chronic environmental noise pollution, such as highway traffic noise, have been known to show decreased ability to discriminate between phonemes (oral language sounds) as well as lower reading scores on standardized tests.
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