PMC

Locating the horizontal notch pattern position. The stars indicate the measured values (Ne calibration lamp) for a pixel row containing the notch pattern. The blue curve indicates a scaled and phase shifted fringe pattern from a pixel row just below the notch pattern to optimally fit the pixels that fall inside the notches. For the pixels that fall outside the notches, an analogous fringe pattern is obtained by scaling and phase shifting the same fringe pattern from below the notches (not shown for clarity). The red curve indicates the final least squares fit result that contains the scaled and phase shifted values for the pixels that are either fully in or fully outside the notches. The values for the pixels that contain a notch boundary are calculated using contributions from both on a subpixel level, e.g., 435/1000th signal from within the notch and 565/1000^th signal from outside the notch. The resulting best fit notch pattern position is shown in green where 0.0 and 0.9 correspond to inside and outside of the notches respectively.

Mean L_d in dB SPL as a function of L₂ in dB (both SPL and FPL) for normal-hearing (top panel) and hearing-impaired (bottom panel) participants. Circles represent data collected following SPL calibration at 4 kHz (filled) and at the notch frequency (open); squares represent data collected following FPL calibration at 4 kHz (filled) and at the notch frequency (open).

Area under the ROC curve (A_ROC) as a function of L₂. Filled circles represent A_ROC calculated from data collected following SPL calibration, and open circles represent A_ROC calculated from data collected following FPL calibration. The top panel displays A_ROC when DPOAEs were measured at 4 kHz and the bottom panel displays A_ROC when DPOAEs were measured at each individual’s notch frequency.

Predicted threshold (dB HL) as a function of measured behavioral threshold (dB HL) with SPL and FPL calibration at 4 kHz and at the notch frequency. Dashed lines are SLR fits that characterize the relationship between the predicted and measured threshold. Correlations, numbers of subjects and rms errors (dB) are provided in each panel.