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Accounting quantitatively for sensitivity to envelope-based interaural temporal disparities at high frequencies
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10.1121/1.3466877
/content/asa/journal/jasa/128/3/10.1121/1.3466877
http://aip.metastore.ingenta.com/content/asa/journal/jasa/128/3/10.1121/1.3466877
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

A re-plotting of the results of Fig. 2 from Bernstein and Trahiotis (2009). Mean normalized threshold ITDs, calculated across four listeners as a function of the exponent of the 4-kHz-centered raised-sine stimuli. Normalized threshold ITDs obtained with 4-kHz-centered transposed stimuli are plotted at the far right. The normalization was accomplished by dividing an individual listener’s threshold ITDs by that listener’s threshold ITD obtained with an SAM tone (raised-sine exponent equal to 1.0) having a frequency of modulation of 128 Hz. Error bars represent plus and minus one standard error of the mean normalized thresholds.

Image of FIG. 2.
FIG. 2.

Normalized threshold ITDs plotted as a function of the values of each of four candidate envelope measures computed on the physical stimuli (see text). The parameter in each plot is rate of modulation and the value of the exponent of the raised-sine is indicated within each symbol. Threshold ITDs obtained with transposed tones are identified by a “T” within the symbol. The relevant value of the coefficient of determination, , is given in each panel.

Image of FIG. 3.
FIG. 3.

Similar to Fig. 2 with the exception that the envelope measures were computed on the stimuli as processed via stages of a model designed to mimic features of peripheral auditory processing. In contrast to Fig. 2, the measure “deadtime” was excluded because processing via the model rendered that measure invalid (see text).

Image of FIG. 4.
FIG. 4.

Mean normalized threshold ITDs as a function of rate of modulation, for raised-sine exponents of 1.0 and 8.0, respectively. Closed triangles represent thresholds obtained when the depth of modulation was 25%; closed squares represent thresholds obtained when the depth of modulation was 100%. Error bars represent plus and minus one standard error of the mean. The open triangles and squares represent data from Bernstein and Trahiotis (2009) which were obtained with a rate of modulation of 128 Hz. Solid and broken lines represent predicted values of threshold computed via an interaural correlation-based model and while employing auditory filters centered at the frequencies indicated in the legends.

Image of FIG. 5.
FIG. 5.

Waveforms resulting from processing via the “front-end” of the normalized interaural correlation model (see text). The stimulus was a 4-kHz-centered raised-sine having an exponent of 1.0 (SAM tone) and modulated at 256 Hz. The solid line depicts the waveform resulting from centering the (gammatone) bandpass filter at 4000 Hz; the dotted line depicts the waveform resulting from centering the (gammatone) bandpass filter at 4500 Hz.

Image of FIG. 6.
FIG. 6.

Same as Fig. 5 except that the rate of modulation of the raised-sine stimulus was 32 Hz.

Image of FIG. 7.
FIG. 7.

Normalized threshold ITDs from Fig. 4, plotted as a function of the values of each of three candidate envelope measures computed on the physical stimuli (see text). The parameter in each plot is rate of modulation and the value of the exponent of the raised-sine is indicated within each symbol. Thicker-edged symbols represent data obtained when the depth of modulation was 100%; thinner-edged symbols represent data obtained when the depth of modulation was 25%.

Image of FIG. 8.
FIG. 8.

Same as Fig. 5 with the exception that the envelope measures were computed on the stimuli as processed via stages of a model designed to mimic features of peripheral auditory processing. The center frequency of the auditory filter employed within the model was 4500 Hz.

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/content/asa/journal/jasa/128/3/10.1121/1.3466877
2010-09-03
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Accounting quantitatively for sensitivity to envelope-based interaural temporal disparities at high frequencies
http://aip.metastore.ingenta.com/content/asa/journal/jasa/128/3/10.1121/1.3466877
10.1121/1.3466877
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