When speaking to infants, adults typically alter the acoustic properties of their speech in a variety of ways compared with how they speak to other adults; for example, they use higher pitch, increased pitch range, more pitch variability, and slower speech rate. Research shows that these vocal changes happen similarly across industrialized…

One concern in current sociolinguistic theories of language variation is to find dynamic models that integrate rules governing the 'lects' of a language into a unified description of that language. The dynamics of language change in the variations inherent to the Fijian dialect chain have profound implications for language literacy and educational…