Topographical comparison of the non-target stimulus processing (epoch = 0–600 msec) for the older and younger participants: The top panel shows the grand-averaged mean global field power (MGFP) waveforms for the <i>clear</i> and <i>degraded</i> listening conditions in each group.

Timeframes in the shaded region indicates periods of statistically significant differences (p < 0.01) between listening conditions. The bottom panel shows the corresponding topographical maps that are linked to the shaded timeframes of the MGFP for each listening condition.