Recent decades have seen an increase in research informing our understanding of the complex ways in which bilingual development is shaped by biological, cognitive, and behavioral factors. We investigate the predictors that shape, drive, and constrain the development of the first language (L1) of bilinguals, focusing on 92 Turkish-English bilingual…

This investigation aimed to provide insights into the controversial debate on the role that age at onset of bilingualism plays in human language capacity with a focus on what it entails for first language (L1) attrition. L1 performance of Turkish immigrants (n = 57) in the United Kingdom with age at onset ranging between 7 and 34 years was…

This study investigated whether children born in a second language (L2) environment pronounce their L2 with foreign accents and, if so, when foreign accents first emerge. This study also examined the latest age of onset (AO) of extensive L2 experience at which native L2 pronunciation is possible and explored several factors that affect the degree…