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Auditory steady-state responses to chirp stimuli based on cochlear traveling wave delaya)
a)Portions of this work were presented in “Chirp stimuli–underlying assumptions,” at the NHS-Conference, Como, Italy, May 2006; “ASSR stimuli based on design in the frequency domain and cochlear modelling,” at the BAA-conference, Telford, United Kingdom, November, 2006; “ASSR stimuli for hearing testing of newborns and children,” at the AAA-conference, Denver, CO, April, 2007, and “Chirp stimuli based on cochlear traveling wave delay,” at the IERASG-conference, Bled, Slovenia, June 2007.
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10.1121/1.2783985
/content/asa/journal/jasa/122/5/10.1121/1.2783985
http://aip.metastore.ingenta.com/content/asa/journal/jasa/122/5/10.1121/1.2783985

Figures

Image of FIG. 1.
FIG. 1.

Latency-frequency functions extracted from: (1) narrow-band ACAP (Eggermont, 1979), (2) tone-burst ABR (Neely et al., 1988), (3) narrow-band ABR (Don-data, Don et al., 2005a), and a cochlear model (de Boer, 1980). On each latency-frequency function the fitting formula and the retrieved parameter values are indicated. Also included are the four data points (Table I) that are used for the curve fitting of the Don-data.

Image of FIG. 2.
FIG. 2.

The Don latency-frequency function (Fig. 1) applied to a linear system. The calculated group delay, phase delay, and phase response are shown together with the corresponding equations.

Image of FIG. 3.
FIG. 3.

Demonstration of how a broadband stimulus with a repetition rate of 20/s is obtained by taking the sum of a harmonic series of cosines with the frequencies . (From the harmonic series are shown the first three cosines followed by the cosines that are spaced by approximately half an octave). All cosines have equal amplitude and are given a phase delay in accordance with the values in Fig. 2 (Don-data).

Image of FIG. 4.
FIG. 4.

Broad band stimulus with a repetition rate of 20/s obtained by adding together a harmonic series of cosines with the frequencies all with equal amplitude. Three different sets of phase delay values are used: (top, “modified click”) Phase delay=model delay (Fig. 2); (middle, “click”) phase delay ; and (bottom, “chirp”) phase delay=negative value of the model delay (Fig. 2).

Image of FIG. 5.
FIG. 5.

Three different chirps calculated similarly to the broadband chirp in the bottom curve of Fig. 4, but based on a repetition rate of 90/s. The broadband covers the frequency range . From the original latency-frequency functions by Neely et al. (1988), de Boer (1980), and the Don-data shown in Fig. 1, the negative values of the corresponding phase delays are used for the calculations. The chirps are called: Neely et al. chirp, de Boer chirp, and Don chirp.

Image of FIG. 6.
FIG. 6.

(a) Grand average ASSR wave forms at for the three chirps and the reference click stimulus after a recording time of . The calculated peak-to-peak amplitudes are shown for each wave form. (b) Grand average ASSR wave forms at for the three chirps and the reference click stimulus after a recording time of . The calculated peak-to-peak amplitudes are shown for each wave form.

Image of FIG. 7.
FIG. 7.

Peak-to-peak amplitudes of the grand average ASSR wave forms [Figs. 6(a) and 6(b)] plotted vs stimulus level.

Tables

Generic image for table
TABLE I.

Derived-band ABR center frequencies and the corresponding observed wave V latencies for the Don-data . The latencies corrected by are shown in the last column, which also indicates that only the corrected latencies for the four lower frequency bands are used for the construction of the final latency-frequency function in Fig. 1.

Generic image for table
TABLE II.

For each stimulus condition (stimulus type and level), the number of subjects tested, the detection rate (in % and fractions), the detection time within (median and 5%–95% percentile), and the SNR at a recording time of (median and 5%–95% percentile) are shown.

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2007-11-01
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Auditory steady-state responses to chirp stimuli based on cochlear traveling wave delaya)
http://aip.metastore.ingenta.com/content/asa/journal/jasa/122/5/10.1121/1.2783985
10.1121/1.2783985
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