Figure 2

Topographic maps of ERP amplitudes. Topography of the ERP was first inspected to determine which electrodes to focus on. Topographic maps showing the amplitude distribution elicited following presentation of the single and second tone based on the grand average waveforms calculated for the adult sample (upper panel) and the child sample (lower panel). The average amplitude from 0-252 ms is displayed in 36 ms time intervals: 0-36 ms, 36-72 ms, 72-108 ms, 108-144 ms, 144-180, 180-216 ms, 216-252 ms. Blue shading indicates negative amplitude with respect to the pre-stimulus baseline and red shading indicates positive amplitude with respect to the pre-stimulus baseline, with maximal scaling between -4 μV to 4 μV.