Influence of primary-level and primary-frequency ratios on human distortion product otoacoustic emissionsa)
Contour plots representing DPOAE level in stimulus space. Each column represents data for a different and each row represents a different , as indicated on the figure. The contours are spaced in increments of DPOAE level. As a reference, the contour corresponding to SPL is indicated with a thicker line. The maximum DPOAE level in panels without a reference (, ) is SPL. The slanting, straight lines in each panel describe the relationship producing the largest DPOAE level at each . Our approach for fitting this line is described in the text.
The slope of the average, optimal path as a function of . The parameter is .
DPOAE level is plotted as a function of with primary-frequency ratio as a parameter. Each panel represents a different , as indicated. The solid line in each panel represents DPOAE level for . Shorter dashes correspond to and longer dashes correspond to . The line thickness represents the distance the frequency ratio is from 1.20, with and 1.40 indicated by the thinnest dashed lines.
Mean DPOAE level as a function of frequency ratio. Each panel represents data for a different . Here, the parameter is , with decreasing line thickness indicating increasing in increments of . When , data for SPL are plotted; for all other frequencies data are plotted for ranging from SPL.
Mean DPOAE level as a function of frequency ratio when and , 50, and SPL (indicated with decreasing line thickness). Errors bars represent standard deviation.
Our approach to specifying optimal stimulus parameters. The upper panel plots as a function of while the lower panel plots as a function of . The parameter is , as indicated within the upper panel. The symbols shown in each panel correspond to the (upper panel) or (lower panel) producing the largest DPOAE at each . The lines in each panel represent the best fit to the stimulus conditions producing the maximum DPOAE according to the approach described in the text. The equations describing these lines are shown as an inset in each panel.
DPOAE level as a function of . Each panel represents a different . The parameter is the stimulus condition used to record the DPOAE, as indicated in the legend. The nearly horizontal lines near the bottom of each panel represent the corresponding noise levels.
DPOAE noise levels as a function of frequency ratio with each panel corresponding to a different . Each symbol corresponds to a different path as indicated in the legend.
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