Palatalization of the glide in Frisian raising diphthongs as a case of shift

In Modern West Frisian, by New Frisian Breaking, two rising diphthongs have developed with initial /w/. However, in the eastern part of the language area these sequences are nowadays pronounced as (jo) and (ja), respectively. The change started when immigrant peat diggers became integrated into Frisian society, and as a result of imperfect learning did not master fully those difficult Frisian diphthongs. As an escape strategy, they fronted the initial glide to /j/. A second centre of hange was at the language border, where peat-digging also resulted in the mixing of populations. In the course of the 20th century, the new forms were rapidly spread- ing. An analysis of the change as a case of shift (cf. Thomason and Kaufman 1988) can nicely explain the platalization of the glide, and moreover, it gives insight into the question why this only oc- curred after labials. In the case of a minority-majority contact situ- ation, however, change by shift in the minority language is not to be expected in the first place, as it requires that a population is switching to a target language that is less powerful or prestigeous. However, the peat diggers all spoke a Dutch Low Saxon dialect, which had a low prestige, indeed.