Estimates state that bi- or multilingualism is presumably the rule rather than the exception. We carried out studies about the activation and representation of sounds from one vs. more language inventories.
For instance, when we read texts in our second language, do we activate sounds and phonological representations of our first language as well? We have been able to show that L2 phonology is active during L1 processing and vice versa. This argues for one large phonological inventory that is non-selectively activated.