A key index of top-down control in task switching--preparation for a switch--is underexplored in language switching. The well-documented EEG "signature" of preparation for a task switch--a protracted positive-polarity modulation over the posterior scalp--has thus far not been reported in language switching, and the interpretation of…

This study explored appropriate speaking activities for speakers of different proficiency levels by measuring the changes in their brain blood flow with near-infrared spectroscopy (NIRS). Fifty adult speakers and learners of English of various proficiency levels participated in the study by undertaking four types of task: a single-speaker picture…