Effects of theta burst stimulation over the dorsolateral prefrontal cortex on language switching - A behavioral and ERP study.

Pestalozzi, Maria; Annoni, Jean-Marie; Müri, René M.; Jost, Lea B (2020). Effects of theta burst stimulation over the dorsolateral prefrontal cortex on language switching - A behavioral and ERP study. Brain and language, 205(104775), p. 104775. Elsevier 10.1016/j.bandl.2020.104775

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This study investigated the role of the left dorsolateral prefrontal cortex (DLPFC) in language switching using theta burst stimulation (TBS) and electroencephalography in late bilinguals. After a sham-controlled baseline, participants received either excitatory or inhibitory TBS over the left DLPFC before conducting picture naming tasks in pure language blocks and a language switching block, as well as a nonverbal switching task. On the behavioral level, we found no effect of TBS. However, the ERP-analysis revealed an effect of Stimulation for the picture naming tasks, characterized by alterations in the left DLPFC at 20-72 ms, and in networks associated with conflict resolution and self-monitoring at 533-600 ms. As we did not find an interaction between Stimulation and Block (switching vs non-switching), prefrontal stimulation did not specifically modulate interlanguage control. The left DLPFC might rather be involved in enhancingmaintenance of task demands and self-monitoring during language production in both mono- and bilingual contexts.

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