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Temporary hearing loss influences post-stimulus time histogram and single neuron action potential estimates from human compound action potentials
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10.1121/1.2885748
/content/asa/journal/jasa/123/4/10.1121/1.2885748
http://aip.metastore.ingenta.com/content/asa/journal/jasa/123/4/10.1121/1.2885748

Figures

Image of FIG. 1.
FIG. 1.

A histogram indicating the number subjects having a given degree of temporary threshold shift (TTS) measured at the cessation of noise exposure.

Image of FIG. 2.
FIG. 2.

CAPs evoked from a pSPL click stimulus for one subject (NH14) before (left panel) and after (right panel) noise exposure. Gray lines represent the CAPs and the solid and dotted lines represent the analytic CAP.

Image of FIG. 3.
FIG. 3.

Post-stimulus time histogram (left) and single-neuron action potential (right) estimates derived from fitting the analytic CAP [Eq. (A7)] to CAPs of Fig. 2 before (solid line) and after (dotted line) noise exposure. and coefficients of Eqs. (2) and (3) are indicated within the respective graphs. Parameter of Eq. (1) is given in the left panel.

Image of FIG. 4.
FIG. 4.

Average ( standard error of mean) Pearson correlations between the analytic CAP and physiologic CAPs as a function of signal level before (solid line) and after (dotted line) noise exposure. Control subjects are not included by postnoise data presented here.

Image of FIG. 5.
FIG. 5.

Interclass correlation coefficients [(ICC), Eq. (4)] for control subject CAP parameters of Eqs. (2) and (3) as a function of signal level acquired before and after a silent period. Given the degrees of freedom, the horizontal gray line indicates a significant ICC.

Image of FIG. 6.
FIG. 6.

Poststimulus time histogram “width” parameter of Eq. (2) before (dark circles) and after (gray triangles) noise exposure as a function of signal level. Table I coefficients provided from the hierarchical linear modeling [(HLM), Eqs. (5) and (6)] of the prenoise were used to construct the solid line. The dashed line represents the results of the postnoise HLM reconstructed from Table II coefficients.

Image of FIG. 7.
FIG. 7.

Top panel illustrates post-stimulus time histogram “latency” parameter of Eq. (2) before (dark circles) and after (gray triangles) noise exposure as a function of signal level. Table I coefficients obtained from HLM [Eqs. (5) and (6)] of prenoise were used to construct the solid. The dashed line represents HLM coefficients of postnoise from Table II coefficients. The middle panel shows the variation in the intercept of the -signal level function with degree of threshold shift (TTS). The dotted line is the solution to Eq. (6) using values from Table II. The lower panel characterizes the behavior of the HLM linear term of the -signal-level function as degree of TTS. The random error for the linear HLM term was not significant, and thus no scatter appears at the bottom.

Image of FIG. 8.
FIG. 8.

“Scaling” parameter from Eq. (1) before (dark circles) and after (gray triangles) noise exposure as a function of signal level (left panel). Results of HLM [Eqs. (5) and (6)] reconstructed from Table I values are represented as the solid line and the postnoise HLM reconstructed from Table II values are represented as the dashed line. In the right panel is the same data as in the left panel, plotted on a log–log axis.

Image of FIG. 9.
FIG. 9.

Single-neuron action potential “decay” parameter from Eq. (3) before (dark circles) and after (gray triangles) noise exposure as a function of signal level (top panel). The solid line was reconstructed from Table I HLM [Eqs. (5) and (6)] coefficients of prenoise . Similarly, the dashed line was obtained by solving the HLM Eq. (5) with values given in Table II. The circles in the bottom panel are the intercepts postnoise -signal level functions—estimated from the HLM—vs TTS. The dotted line is the level 2 HLM function, i.e., Eq. (6).

Image of FIG. 10.
FIG. 10.

Single-neuron action potential “frequency” parameter from Eq. (3) before (dark circles) and after (gray triangles) noise exposure as a function of signal level. The solid line was constructed by solving the HLM Eq. (5) using Table I prenoise HLM coefficients. The dashed line is the postnoise -signal-level function estimated from the HLM, the coefficients of which are in Table II.

Image of FIG. 11.
FIG. 11.

-signal-level functions constructed from HLM coefficients of Table II using the TTS level 2 independent variable [Eq. (6)] varying from . Iso-intensity plots for pSPL (stars) and pSPL (cross hair circle) derived from data of the top panel are shown in the bottom panel.

Image of FIG. 12.
FIG. 12.

Parameter -signal-level functions constructed from HLM [Eqs. (5) and (6)] coefficients of Table II using the TTS level 2 independent variable [Eq. (6)] that varied from .

Tables

Generic image for table
TABLE I.

Prenoise HLM coefficients

Generic image for table
TABLE II.

Postnoise HLM coefficients.

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/content/asa/journal/jasa/123/4/10.1121/1.2885748
2008-04-01
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Temporary hearing loss influences post-stimulus time histogram and single neuron action potential estimates from human compound action potentials
http://aip.metastore.ingenta.com/content/asa/journal/jasa/123/4/10.1121/1.2885748
10.1121/1.2885748
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