Figure 3. (A) N1 amplitude, difference score (post-test – pre-test) in frontal and central electrodes in the standard condition of the oddball task in choir and control groups. (B) ERPs recorded at Fz during standard condition of the oddball task in the choir and control groups at pre and post-test. (C) Topographic headplots for N1 during oddball task in choir and control groups in the standard condition.