Inhibition has been suggested as the executive control system that allows successful linguistic selection even when both languages are co-activated in bilinguals. De Groot & Christofells (2006) proposed a distinction between two types of inhibition that may occur; global inhibition and local inhibition. Global inhibition refers to suppression of an entire language system, e.g. inhibiting Spanish when speaking English, and local inhibition refers to inhibition of a more specific competing vocabulary, e.g. the translation of the same word or phrase. Local inhibition mostly affects linguistic performance whereas global inhibition affects both linguistic and cognitive performance. Despite the apparent advantages for bilinguals in terms of non-linguistic cognitive processing, there seem to be some drawbacks for bilinguals in terms of linguistic cognitive processing: bilinguals have been shown to exhibit reduced speech fluency and speed of lexical access compared to monolinguals.