Contextual information (how something has been said and who said it) has been usually neglected in mainstream models of speech perception. However, there is evidence indicating that this contextual information may play a very important role in the processing of the speech signal. Furthermore, there is ample evidence showing that the speech perception system is shaped by the properties of the input. In the present project we aim at exploring how the speech processing system of individuals who live in a bilingual environment deals with contextual variability. The interest of testing this population is motivated by the fact that on average bilingual environments involve more varied input. We plan to test both the developing system of infants and toddlers and the fully operating system of adults