Figure 4

Grand-averaged ERPs synchronised with onset of second tone. Grand averaged ERPs at Fz, Cz, T7, and T8 elicited to the second tone in the pair, corrected for response overlap by subtraction of the ERP to the single tone. The x-axis represents time (in ms) from 50 ms prior to the onset of the second tone in the pair to 400 ms post-stimulus, with tic marks at 100 ms intervals from the start of the epoch. The y-axis represents the voltage with reference to a linked mastoid reference (in microvolts), with negative voltages plotted as a downward deflection. Grand-averaged waveforms for the adult sample are shown in the upper panel and grand-averaged waveforms for the child sample are shown in the lower panel of the figure.