ROC curve area as a function of (dB SPL). Results for and are shown in the left and right panels, respectively. The parameter in each panel is test condition, with the control condition represented by the thick, solid line and the suppression conditions indicated by the dashed lines. Increasing dash thickness indicates increasing suppressor level.
DPOAE level (dB SPL) as a function of (kHz) for the 1/3 octave interval surrounding with SPL. Each column represents data for a different normal-hearing subject with each row representing a different test condition. Data for the control condition are plotted in the top row, with suppressor level increasing from top to bottom, as indicated by the inset in each panel. Within each panel the thick solid lines and dashed lines represent the DPOAE level and the thin solid lines near the bottom of each panel represent the associated noise.
The average overall DPOAE level (top row) and average fine-structure depth (bottom row) for the three suppression conditions relative to the control condition for the small group of subjects in whom diagnostic errors were most likely. Standard error bars represent s.d. Results for are plotted in the left column with corresponding data for in the right column. The results for the normal and impaired ears are represented by the open and closed circles, respectively. The horizontal dashed line represents the point at which the control and suppression conditions are equivalent. These data were obtained from the DCT analyses as described in the text.
Cumulative percentages of DPOAE level (dB SPL) for the (left column) and (right column) conditions for the small group of subjects (see the text for details). The rows represent, from top to bottom, results for the control condition, the three suppression conditions, and the frequency-smoothing (DCT) condition. The parameter in each panel is subject group (normal or impaired), as indicated in the legend. The arrows in each panel indicate the 50th percentile of DPOAE level for the normal and impaired ears. Also shown as an inset in each panel is the for each test condition for this group of subjects.
Behavioral threshold (dB HL) as a function of DPOAE threshold (dB SPL) for two approaches to estimating DPOAE thresholds when . The left column represents DPOAE thresholds obtained from the DPOAE I/O functions using the Gorga et al. (2003) modification of the Boege and Janssen (2002) technique (the I/O-function approach). The right column represents comparable data when the SNR point is taken as the DPOAE threshold (the SNR approach). Each row represents data for a different suppression condition with suppressor level increasing from the top to the bottom. Solid lines in each panel represent linear fits to the data. The associated linear equations are shown as insets in each panel.
Behavioral threshold (dB HL) as a function of DPOAE threshold (dB SPL) for the two approaches to estimating DPOAE thresholds when . The plotting convention is the same as for Fig. 5.
Cumulative percentage of the behavioral thresholds (dB HL) for those I/O functions not meeting the Gorga et al. (2003) SNR inclusion criterion (top row) or the regression inclusion criteria (bottom row) when using the I/O-function approach to estimate DPOAE threshold. Data for the 2 and conditions are plotted in the left and right columns, respectively. The parameter within each panel is test condition. The control condition is represented by the thick, solid line, with increasing suppressor level represented by dashed lines of increasing thickness.
Average DPOAE level (dB SPL) as a function of (dB SPL) when . Each panel plots the average DPOAE level as a function of for all ears with the same behavioral threshold, the inset in each panel indicates the number of ears contributing in the control condition. Test condition is indicated by line type and thickness. Data for the control condition are plotted as thick solid lines with increasing suppressor level indicated by dashed lines with increasing thickness.
Average DPOAE level (dB SPL) as a function of (dB SPL) when . The plotting convention is the same as for Fig. 8.
Average standard deviation (dB) of DPOAE level across the entire I/O function as a function of test condition for each of 12 behavioral-threshold categories when . These data represent the standard deviations associated with the I/O functions shown in Fig. 8.
Average standard deviation (dB) of DPOAE level across the entire I/O function as a function of test condition for each of 12 behavioral-threshold categories when . These data represent the standard deviations associated with the I/O functions shown in Fig. 9.
Optimal suppressor levels for reducing DPOAE fine structure.
Summary of the threshold prediction results for and . Number of ears meeting the inclusion criteria for two approaches to threshold prediction along with correlations and associated standard errors for the four test conditions.
These data refer to the I/O-function approach to estimating DPOAE threshold. Shown here are the number of ears that did not meet the SNR and regression-based inclusion criteria, the percentage of these ears that have behavioral thresholds HL, and the mean thresholds and standard deviations for these ears when and .
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