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The ERP ROI waveforms averaged across F3, Fz, F4, C3, Cz, and C4 electrodes for CI singers and CI non-singers for standard tones and for (A) timbre changes, (B) pitch changes, (C) gap changes and (D) duration changes. The ERP waveforms are given for both time points of the measurements (T1 and T2 on the left and right in each panel, respectively).
