Response waveforms mimic stimulus waveforms (displayed in Fig. 2) across groups and conditions. Group average response waveforms to DISH and DITCH are displayed in young normal-hearing (YNH), older normal-hearing (ONH), and older hearing-impaired (OHI) listeners, YNH: unprocessed = blue, vocoded = cyan; ONH: unprocessed = red, vocoded = pink; OHI: unprocessed = black, vocoded = gray