We don't fully recognise it, but our manner of speech is constantly changing based on how those around us speak. And as Liberman points out, uptalk is something that's always been in our manner of speech, just not necessarily as pronounced as today. "In all variations of English," he explains," there are a set of circumstances in which rising patterns are used not in polar questions - that is, yes or no questions. Uptalk has always been available, just below the surface, because there are circumstances in which speakers not thought to be uptalkers use uptalking characteristics."
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