First language (L1) attrition research focuses on syntactic and morphological deterioration in environments where L1 "attriters" rarely have contact with their L1, such as immigrants. There is no study that investigates L1 attrition in tones and in contexts where L1 can still be often heard. This study examines this attrition type in…

How bilinguals' two languages interact with each other has stimulated considerable research. However, little of this research has focused on objective measures of speech production. This study aims to investigate bilinguals' production of Guoyu and Taiwanese voiceless sibilant fricatives to see how language contact and language dominance influence…