Investigation of long- and short-term adaptations of the bilingual language system to different language environments: Evidence from the ERPs

Does a long-term stay in a foreign language country affect word retrieval in our native language? And if so, are the effects reversible? The present study explored the neural correlates of single word production in the native language and their dynamics due to two types of changes in the language environment: long-term immersion in a foreign language (L2) environment and short-term reimmersion in a native language (L1) environment. We tested Polish-English migrants living in the UK (L2 environment) for an average of ten years and Polish-English controls living in Poland (L1 environment). All participants performed an L1 picture-naming task while we recorded their electrophysiological responses. The migrants were tested before and after visiting the L1 environment, while the controls were tested twice in their L1 environment. Our focus was on two event-related components previously associated with the ease of lexical access: P2 and N300. We found no modulations related to N300 but some in the P2 time window, although their distribution was more frontal than previously reported. There was no main effect related to the long-term immersion in the L2 environment, suggesting that the effectiveness to produce words in L1was similar across the two groups . However, the short-term change in the language environment modulated the early positivity in migrants: smaller frontal positivity was reported in response to picture naming after the short reimmersion in the L1 environment than during the L2 immersion. These results indicate that the short-term changes in the language environment induce modulations in the neural response, which may reflect higher proactive control applied in L1 production during L2 immersion and its reduction after short-term L1 immersion.