In the United States, the phenomenon of HRT may be fairly recent but is an increasingly common characteristic of speech especially among younger speakers. However, serious scientific and linguistic inquiry on this topic has a much more extensive history in linguistic journals from Australia, New Zealand, and Britain where HRT seems to have been noted as early as World War II. It has been noted in speech heard in areas of Canada, in
Cape Town, the
Falkland Islands, and in the United States where it is often associated with a particular
sociolect that originated among affluent teenage girls in southern California (see
Valleyspeak and
Valley girl). It was observed in Mississippi in 1963 (see "Twirling at Ole Miss" in
Red-Dirt Marijuana and Other Tastes). Elsewhere in the United States, this tonal pattern is characteristic of the speech heard in parts of the rural
upper Midwest that have come under the influence of
Norwegian phonology through
Norwegian migration to Minnesota and
North Dakota. Although it is characterized in Britain as "Australian question intonation" (AQI) and blamed on the popularity of
Australian soap operas among teenagers, HRT is also a feature of several Irish-English dialects, especially in
mid-Ulster and Belfast English. Research published in 1986, regarding vernacular speech in
Sydney, suggested that high rising terminal was used more than twice as often by young people than older people, and was more common among women than men. In other words, HRT was more common among women born between 1950 and 1970, than among men born before 1950. The same research (and other sources) also suggested that the practice often served to discourage interruption, by indicating that a speaker had not quite completed a particular statement. and other varieties of Spanish. == Effects ==