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Low-frequency and high-frequency distortion product otoacoustic emission suppression in humans
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10.1121/1.2839138
/content/asa/journal/jasa/123/4/10.1121/1.2839138
http://aip.metastore.ingenta.com/content/asa/journal/jasa/123/4/10.1121/1.2839138

Figures

Image of FIG. 1.
FIG. 1.

Top row: Mean DPOAE (squares) and noise (triangles) levels in dB SPL as a function of suppressor level, , in dB SPL. Bottom row: Mean DPOAE decrements (circles) in dB as a function of . Left column shows data when ; right column shows data when . In both cases, SL, and an on-frequency suppressor was used ( and for and , respectively). Closed symbols represent the transformed data points and the line represents a linear regression fit to the closed symbols. In all cases, error bars represent The short vertical dashed lines in the bottom row of panels are drawn at a decrement of , which was used as suppression threshold for the construction of STCs.

Image of FIG. 2.
FIG. 2.

DPOAE and noise levels for the control conditions, in which there was no suppressor. Top: Mean DPOAE (squares) and noise (triangles) levels in dB SPL as a function of in dB SL when . Bottom: Mean DPOAE (squares) and noise (triangles) levels in dB SPL as a function of in dB SL when . In both panels, error bars represent

Image of FIG. 3.
FIG. 3.

Mean DPOAE decrements in dB as a function of in dB SPL when and SL. Error bars represent Suppressor frequency is indicated within each panel. Closed symbols represent the transformed data to which a linear regression, represented by the solid line, was fit. The short vertical dashed lines in each panel are drawn at a decrement of , which was used as suppression threshold for the construction of STCs.

Image of FIG. 4.
FIG. 4.

Mean DPOAE decrements in dB as a function of in dB SPL when and SL. Error bars represent Suppressor frequency is indicated within each panel. Closed symbols represent the transformed data to which a linear regression, represented by the solid line, was fit. The short vertical dashed lines in each panel are drawn at a decrement of , which was used as suppression threshold for the construction of STCs.

Image of FIG. 5.
FIG. 5.

Mean slopes of the decrement-vs- functions as a function of for (circles) and (triangles). Data are plotted on a log frequency scale in the left column and a relative (octave) frequency scale in the right column.

Image of FIG. 6.
FIG. 6.

Mean suppression tuning curves, in which the for of suppression is plotted as a function of , following the conventions used in Fig. 5.

Image of FIG. 7.
FIG. 7.

Slopes of the decrement functions as a function of , based on multiple linear regression in which and were included in the regression analysis. Open symbols represent the slopes of the decrement-vs- functions and closed symbols represent the slope of the decrements vs . Circles represent data when and triangles represent data when .

Image of FIG. 8.
FIG. 8.

Mean STCs for 500 and . Top: STCs constructed using simple linear regressions that were fit to the decrement-vs- functions. Bottom: STCs constructed using multiple linear regressions that were fit to the decrement-vs- functions. Within each panel, increases from the STC with the lowest suppression threshold to the highest. Superimposed in both panels are the mean behavioral thresholds (closed circles) for all the and frequencies used in the present study.

Image of FIG. 9.
FIG. 9.

for of suppression as a function of (dB SL) for on-frequency (closed squares) and low-frequency (open squares) suppressors. The low-frequency suppressor was approximately 1 octave below . Top and bottom rows show results for simple and multiple linear regressions, respectively. Left and right columns show data for and , respectively. The lines represent linear fits to each set of data. Slopes of these lines are provided as insets adjacent to the line to which they apply.

Image of FIG. 10.
FIG. 10.

Tip-to-tail difference (in dB) as a function of (dB SL) when (open circles) and when (closed circles). Top and bottom panels show the results for simple and multiple linear regressions, respectively.

Image of FIG. 11.
FIG. 11.

as a function of (dB SL) following the conventions used in Fig. 10.

Image of FIG. 12.
FIG. 12.

Best frequency in octaves (re: ) as a function of (dB SL), following the conventions used in Figs. 10 and 11. The dashed line is drawn at 0 octaves relative to and provides a point of reference.

Image of FIG. 13.
FIG. 13.

Tip-to-tail difference as a function of , following the convention used in Figs. 10–12. Circles represents data for and triangles represent data for . For both frequencies, the point with the lowest tip-to-tail difference/ represents results for the highest level ( SL at both frequencies) and the points with the largest /tip-to-tail difference represent results for the lowest levels ( SL at and SL at ). Lines in each panel (SLR and MLR) represent linear fits to the data.

Tables

Generic image for table
TABLE I.

Means and standard deviations for the control condition in each of the 19 subjects at each of the four levels when . Grand means and standard deviations are provided in the bottom two rows.

Generic image for table
TABLE II.

Means and standard deviations for the control condition in each of the 19 subjects at each of the five levels when . Grand means and standard deviations are provided in the bottom two rows.

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/content/asa/journal/jasa/123/4/10.1121/1.2839138
2008-04-01
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Low-frequency and high-frequency distortion product otoacoustic emission suppression in humans
http://aip.metastore.ingenta.com/content/asa/journal/jasa/123/4/10.1121/1.2839138
10.1121/1.2839138
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