“…Speaker intrinsic factors are also relevant to predicting interaction between a bilingual’s two languages. Specifically, the nature and extent of interaction depends on the age of the speaker, the age at which each language was acquired, the amount of input and output in both languages, and the level of proficiency and dominance in the two languages (e.g., Flege, 1991, 2002; Flege et al, 1995, 1997, 1999, 2002; Thornburgh and Ryalls, 1998; Guion, 2003; Fowler et al, 2008; Simonet, 2010; Antoniou et al, 2011; Lee and Iverson, 2012). …”