Sixty years of bilingualism affects the pronunciation of Latvian vowels

For fifty years after World War II, Latvia was incorporated into the former Soviet Union. Although in theory the use of regional languages was not discouraged, in practice knowledge of Russian was obligatory. Since 1991, Latvian has again become the official language, and knowledge of Russian is widespread but optional. These political events have created a natural experiment in the effects of almost universal bilingualism on a language. To assess the impact on pronunciation, native speakers of Latvian, ranging from retirement age to teens, were recorded reading a word list and a short narrative. Vowel pronunciation differed across the generations both in quantity relationships and in forma…