Fig 1.
Average audiograms for 24 OHI listeners (green) and 16 ONH listeners (blue).
Error bars show standard deviation. The dotted red line shows the estimated average aided audiogram based on prescriptive target for the average OHI audiogram.
Fig 2.
Percent correct scores for the ONH listeners (gray) and for aided (red) and unaided OHI (green) listeners averaged over all consonants in onset and coda positions.
The horizontal positions of the curves were determined by the mean levels of SNRs for ONH and OHI listener groups. Error bars show standard errors.
Fig 3.
(top). Identification thresholds of the 21 consonants, averaged over onset and coda position where possible.
Blue diamonds show ONH thresholds; green circles show unaided OHI thresholds; and red squares show aided OHI thresholds. The consonants on the abscissa are arranged according to increasing thresholds for normal-hearing listeners, which also determined membership in consonant Groups A, B, and C. (Bottom) HA benefit for the 21 consonants. Error bars show standard errors.
Table 1.
Mid-frequency PTA (MPTA), unaided consonant identification threshold elevations (re: ONH listeners) for Groups A, B, and C consonants, mean consonant identification threshold elevations, and z-score elevations for OHI listeners.
Fig 4.
HA benefit plotted as a function of unaided threshold elevation.
The dotted line illustrates the case where the HA benefit equals the unaided threshold elevation, i.e., where aided-OHI and ONH consonant identification would be the same. The solid curve is the second-order polynomial fit for these data. The consonants are color-coded according to their unaided threshold elevations (brown for under 30 dB, yellow for 30–45 dB and dark blue for over 45 dB). See text for further discussion.
Fig 5.
Incidence of different types of phonetic errors for ONH listeners, and for unaided (green) and aided (red) OHI listeners.
Error bars show standard errors.
Fig 6.
Barycentric plots for unaided (green) and aided (red) OHI listeners, and for ONH listeners (blue) in SNR conditions producing similar overall consonant identification performance.
Table 2.
Mid-frequency PTA and HA benefit on consonant identification measures for different consonant groups for individual listeners.
Fig 7.
Scatter plots showing the relation between listeners’ SeRTs and unaided Group A consonant identification thresholds (Panel A) and the relation between HA benefit on Group A consonants and HA benefit on SeRTs (Panel B).