Are you a bilingual or even a multilingual? Have you ever imagined how the lexicons of those languages you have learned are stored, organized and processed in your brain? Are the lexicons stored together like files in the same drawer or are they stored separately? In which way is the information retrieved? Have you ever failed to switch your language to the correct one so you happened to say a word in the "wrong" language when you speak? Well, if it is the case we may be able to provide you with some useful information that helps you understand the underlying principles behind the language interference from the psycholinguistic point of view.