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Aims and Objectives:
Studies on vowel productions of speakers from bilingual communities report not only interactions between the first and second language, but also monolingual-like realizations. The present study expands a prior acoustic investigation of Saterland trilinguals by studying the substrate effect of Saterland Frisian and Low German on the trilinguals’ standard language Northern Standard German. The research aim is to test whether the Northern Standard German vowel productions of the Saterland trilinguals approach the productions of monolingual speakers in terms of durational and spectral features.
Design:
We elicited three repetitions per speaker of the complete inventory of stressed Northern Standard German monophthongs in /hVt/ context to compare the realizations of Northern Standard German vowels in trilingual speakers from Saterland and in monolingual speakers from Hanover, whose variety of Northern Standard German is representative of the larger speech community.
Data and analysis:
In an acoustic analysis, we compared the durational and spectral features using linear mixed effects models. The findings are interpreted with reference to the cross-linguistic vowel productions of the trilingual speakers.
Findings:
For the larger part, the Northern Standard German vowel productions of the trilinguals approach the productions of the monolingual speakers in terms of both durational and spectral features. In addition, the vowel productions of the trilingual speakers suggest a bidirectional interaction between the vowel systems of the trilinguals’ three languages.
Originality:
This investigation is the first to study phonetic interference in vowel production in a situation of long-term language contact involving regional trilingualism and an endangered minority language.
Implications:
Our findings show an orientation towards the larger speech community in the realization of vowel categories in the trilinguals’ standard language. Our study also suggests that the complete inventory needs to be studied to understand the functional constraints by which the multilingual vowel space is organized. It further suggests that a comparison of multilingual with monolingual speakers is necessary to draw conclusions on the mutual subphonemic influence of the individual vowel systems.
