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A computer model of medial efferent suppression in the mammalian auditory system
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10.1121/1.2799914
/content/asa/journal/jasa/122/6/10.1121/1.2799914
http://aip.metastore.ingenta.com/content/asa/journal/jasa/122/6/10.1121/1.2799914

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the modified DRNL filterbank. The modification involves the addition of an attenuation module (ATT) in the nonlinear path. Using ATT it is possible to use changes to a single parameter to simulate the suppressive effect of the efferent system. The amount of attenuation is determined by the amount of efferent activity. Parameters associated with each module are shown in bold letters.

Image of FIG. 2.
FIG. 2.

Basilar membrane peak velocity (m/s) as a function of stimulus sound level for recording sites with BF of (A) and (B) . Animal control data is shown as filled circles with the model control data as a line connecting these points. Measurements made during stimulation of the MOC are represented using unfilled circles and the model efferent data is shown as a line connecting the data points. Animal data is taken from Russell and Murugasu (1997). Model parameters are given in Table I.

Image of FIG. 3.
FIG. 3.

Auditory nerve response (spikes/s) as a function of stimulus sound level (dB SPL). Individual figures show data from simulation of the model with stimuli of frequencies of , , , , , and for auditory nerve fibers with matching CFs (centre frequency). Animal control data is shown as filled circles with the model control data as a line connecting these points. Measurements made during stimulation of the MOC are represented using unfilled circles and the model efferent data is shown as line connecting these points. Animal data is taken from Guinan and Stankovic (1996). Model parameters are given in Table II.

Image of FIG. 5.
FIG. 5.

Auditory nerve compound action potential (CAP) magnitude as a function of (left) stimulus sound level for the animal data and (right) model response. Graph shows the CAP magnitude in response to a tone alone , a tone in the presence of broadband noise , a tone alone whilst stimulating the crossed olivocochlear bundle and a tone in the presence of broadband noise whilst stimulating the crossed olivocochlear bundle . Noise levels used are 21, 26.5, and SPL. Animal data is taken from Dolan and Nolan (1998). Model parameters are given in Table III.

Image of FIG. 4.
FIG. 4.

Method used to simulate the auditory nerve compound action potential (CAP). (Left) Pure tone in silence and (right) pure tone in noise. (A) Initial stimulus. (B) The PSTH output from the auditory nerve stage of the model. (C) Impulse response as defined by Chertoff [2004, Eq. (3)] and (D) final peak CAP for the model during presentation of the tone after each spike in the (B) PSTH has been convolved with the (C) impulse response.

Tables

Generic image for table
TABLE I.

Parameter changes required to fit the computer model response to the physiological data of Russell and Murugasu (1997).

Generic image for table
TABLE II.

Parameter changes used to fit the computer model to the animal data for the control (no MOC) condition (Guinan and Stankovic, 1996). ATT is the attenuation applied to the DRNL filter to simulate the effect of stimulation of the MOC bundle.

Generic image for table
TABLE III.

Parameter changes used to fit the computer model response to the physiological data of Dolan and Nuttall (1988).

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/content/asa/journal/jasa/122/6/10.1121/1.2799914
2007-12-01
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A computer model of medial efferent suppression in the mammalian auditory system
http://aip.metastore.ingenta.com/content/asa/journal/jasa/122/6/10.1121/1.2799914
10.1121/1.2799914
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