Are the two languages represented differently in the bilingual brain?
In a meta-analysis of 52 neuroimaging studies, Suplizio et al. (2020) conclude that L1 and L2 shared a similar neural network, with only few differences depending on the linguistic level (age of acquisition, namely early or late bilinguals). Full text
Few differences of the two neural networks:
Lexico-semantic processing in L1 involves a widespread system of cortico-subcortical regions than L2, especially when L2 is acquired later in life. L2 processing recruits regions exceeding the L1 semantic network and relating to executive control processes.
The language control network reveals a functional overlap between domain-general and bilingual language control networks.