Correlations between mean ERP amplitude differences (μV) between conditions QL (questions on low-probability notes) and QH (questions on high-probability notes), and mean RTs (reaction times) (ms) between the same conditions in the behavioural task, for musicians (white) and nonmusicians (gray). The scatterplots correspond to the four ROIs (LA=left anterior, LP=left posterior, RA=right anterior, RP=right posterior).