Uptalk: The Phenomenon of Rising Intonation

'Uptalk' is commonly used to refer to rising intonation at the end of declarative sentences, or (to put it more simply) the tendency for people to make statements that sound like questions, a phenomenon that has received wide exposure and commentary in the media. How and where did it originate? Who are the most frequent 'uptalkers'? How much does it vary according to the speaker's age, gender and regional dialect? Is it found in other languages as well as English? These and other questions ...