There have been a lot of studies done on language acquisition; Jean
Covered it real well with her references. I just wanted to add that it is
generally accepted by now that All children acquire signs 3-6 months
sooner than speech. Then, if they are exposed to spoken language (that
is, hearing), they
either change over to speech, or add it to their signing--depending on
their environment. No one has ever done a study to show that kids can
read earlier......
Pretty interesting research project for someone.
Joe Martin
Plain old ordinary student
Top Left Corner, USA
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