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Learning performance ratings. Experts were asked to evaluate six aspects of learners’ solo performance (intonation, melody, rhythm, lyric, emotion and overall performance—see section Methods for details). Results revealed that 6 Hz in-phase dual brain stimulation led to better intonation compared to the sham stimulation. **P < 0.01. Error bar represents standard error. The other aspects of the performance were not affected by dual brain stimulation.
