1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Intracochlear pressure and derived quantities from a three-dimensional model
Rent:
Rent this article for
USD
10.1121/1.2747162
/content/asa/journal/jasa/122/2/10.1121/1.2747162
http://aip.metastore.ingenta.com/content/asa/journal/jasa/122/2/10.1121/1.2747162

Figures

Image of FIG. 1.
FIG. 1.

Schematic drawing of the passive cochlear model geometric layout. Distances are parametrized by the Cartesian coordinates , which represent the distance from the stapes, the distance across the scala width, and the height above the partition, respectively. (a) Side, (b) cross section , and (c) top views of the model.

Image of FIG. 2.
FIG. 2.

Schematic of the longitudinal view of organ of Corti, showing the longitudinal tilt of the outer hair cells. The longitudinal distance between the base and apex of the outer hair cells is defined as . The force on the BM to the neighboring OHCs is .

Image of FIG. 3.
FIG. 3.

Best frequency (BF) vs position for the passive cochlear model (solid line) compared to measurements (asterisk), and active cochlear model (dashed-dot line). The present 3D cochlear model represents the cochlear BF-to-place map of gerbil (Sokolich et al., 1976; Greenwood, 1990) over range spanning a length of .

Image of FIG. 4.
FIG. 4.

Basilar membrane (BM) velocity relative to the stapes magnitude (a) and corresponding phase (b) for the gerbil cochlea at from the base . For the active model, , (dashed line) and , (dotted line) were used while for the passive case . Experimental data (expt.) for 30 and SPL corresponding to the active and passive case, respectively, are included for comparison (Ren and Nuttall, 2001). Dashed-dot line in (b): Phase from the model at the from the stapes.

Image of FIG. 5.
FIG. 5.

Radial distribution of intracochlear pressure from the slow wave at different distances from the partition ( from the stapes, ). The location of the BM is indicated by the thickened line (BM ). The pressure drops exponentially with the distance from the BM in either perpendicular or radial direction.

Image of FIG. 6.
FIG. 6.

Combined slow and fast wave intracochlear pressure in the scala tympani (ST) of the gerbil. (a) Intracochlear pressure magnitude and (b) corresponding phase at from the stapes and 3 and away from the BM ( SPL at the stapes: passive). Data are from Olson, (1998, Fig. 10) expt. 2-26. (c) Intracochlear pressure magnitude and (d) corresponding phase at from the stapes and away from the BM ( SPL: passive and SPL: active case). Data are from Olson (2001, Fig. 7) expt. 9-8-98-I-usual.

Image of FIG. 7.
FIG. 7.

Schematic 3D drawing of the cochlear model. Intracochlear pressures and are measured and calculated at the indicated positions and , 15 and away from the BM in the ST respectively, and in SV . These are used to obtain an approximation (Olson, 1998, 2001) for the BM velocity, pressure difference and impedence, and organ of Corti impedance referred to as derived quantities. Cross indicates distance from the stapes.

Image of FIG. 8.
FIG. 8.

Derived BM velocity from the gerbil cochlear model and measurements, using the formulas in Olson [1998, Appendix 1, Eq. (A7)]. (a) Magnitude of the measurement results for 40 and SPL at the ear canal and model results at 70 and at the stapes are plotted re: 0.01 and , respectively ( from the stapes, ). (b) Phase relative to SV pressure at from the stapes. Data are from Olson, (1998, Fig. 18) expt. 2-26 at the stimulus levels of 40 and SPL at the ear canal. (c) Derived BM velocity magnitude and (d) corresponding phase at from the stapes for the passive ( SPL) and active case ( SPL). Data are from Olson (2001, Figs. 15(a) and 15(b)] expt. 9-8-98-I-usual.

Image of FIG. 9.
FIG. 9.

Derived pressure across the OC complex, , from the gerbil cochlear model and measurements, using the formulas in Olson [1998, Appendix 2, Eq. (A10)]. (a) Magnitude. (b) Phase relative to SV pressure at from the stapes . Data are from Olson (1998, Fig. 19) expt. 2-26 at the stimulus levels of 40 and SPL at the ear canal. (c) Derived magnitude and (d) corresponding phase at from the stapes for the passive ( SPL) and active case ( SPL). Data are from Olson [2001, Figs. 15(a) and 15(c)] expt. 9-8-98-I-usual.

Image of FIG. 10.
FIG. 10.

Derived impedance of organ of Corti from the gerbil cochlear model and measurements, using the formulas in Olson (1998). (a) Magnitude. (b) Phase of for model and measurements at from the stapes . Data are from Olson (1998, Fig. 20) expt. 2-26. (c) Real part of and (d) imaginary part of at from the stapes for the passive ( SPL) and active case ( SPL). Data are from Olson [2001, Figs. 15(d) and 15(e)] expt. 9-8-98-I-usual.

Image of FIG. 11.
FIG. 11.

Exact and derived theoretical impedance of organ of Corti from the gerbil cochlear model ( from the stapes, ). The passive model is presented. (a) Magnitude. (b) Phase.

Image of FIG. 12.
FIG. 12.

Exact theoretical impedance of organ of Corti from the gerbil cochlear passive and active model ( from the stapes, ). The 0.15 feed-forward gain factor is used in the active model. (a) Magnitude. (b) Phase.

Tables

Generic image for table
TABLE I.

Material properties for the gerbil cochlear model.

Generic image for table
TABLE II.

Anatomical dimensions as a function of longitudinal position for the gerbil cochlear model.

Loading

Article metrics loading...

/content/asa/journal/jasa/122/2/10.1121/1.2747162
2007-08-01
2014-04-17
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Intracochlear pressure and derived quantities from a three-dimensional model
http://aip.metastore.ingenta.com/content/asa/journal/jasa/122/2/10.1121/1.2747162
10.1121/1.2747162
SEARCH_EXPAND_ITEM