Development of voice onset time in an ongoing phonetic differentiation in Austrian German plosives: Reversing a near-merger

Sound change in the form of plosive mergers has been reported for a variety of languages and is the result of a reduction of phonetic distance between two (or more) sounds. The present study is concerned with the opposite development of phonetic differentiation in plosives (akin to a phonetic split), a less commonly reported phenomenon that is taking place in Austrian German at the moment. A previously small (or null) phonetic distinction between fortis and lenis plosives – a presumed near-merger – is gradually developing into a clear phonetic contrast in younger speakers. In the present study, voice onset time of word-initial plosives was measured in two generations of Austrian speakers (born in the middle and at the end of the 20th century), yielding an ongoing phonetic differentiation where the voice onset time of lenis consonants is shortened while, at the same time, that of fortis consonants is lengthened. These results present an insight into the recent diachronic development of Austrian German and the changes in plosive production that are currently taking place.