Fig. 1.

Group average thresholds in young normal-hearing (YNH, blue circles), older normal-hearing (ONH, red triangles), and older hearing-impaired (OHI, black squares) listeners. Although the ONH listeners have clinically normal hearing, their thresholds are elevated compared to the YNH listeners across the frequency range. Thresholds in the OHI listeners range from mild hearing loss levels in the low frequencies sloping to moderate to severe hearing loss levels in the high frequencies. Error bars show ± 1 standard error. The number of subjects for each group are displayed with the legend