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The effect of overall level on sensitivity to interaural differences of time and level at high frequencies
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10.1121/1.4807827
/content/asa/journal/jasa/134/1/10.1121/1.4807827
http://aip.metastore.ingenta.com/content/asa/journal/jasa/134/1/10.1121/1.4807827
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Threshold ITD for different types of stimuli as a function of stimulus level. The SAM stimulus with  = 128 Hz is indicated by circles and a dashed line in this and all following figures. The transposed tone is marked by upward triangles and the pure tone by downward triangles. In the four left-most panels, the individual data of the four subjects are shown. The data points indicate the median and the error bars indicate the interquartile range from the six measurements of each condition. In the panel on the right-hand side the geometric mean across subjects is plotted, together with the geometric standard errors.

Image of FIG. 2.
FIG. 2.

(Color online) Threshold ITD of SAM tones for different modulation frequencies as a function of stimulus level. The data are plotted in the same format as Fig. 1 . The SAM stimulus with  = 128 Hz is again indicated by a dashed line and the stimulus with  = 32 Hz is indicated by a dashed-dotted line.

Image of FIG. 3.
FIG. 3.

(Color online) Threshold ITD of SAM tones with  = 128 Hz for different configurations of the low-frequency noise at a stimulus level of 56 dB SPL. The data are plotted in the same format as before. (a) Threshold ITDs obtained with different interaural configurations of the low-frequency noise. The diotic condition is plotted in black and the condition with interaurally uncorrelated noise is plotted in gray. (b) Threshold ITDs obtained with noises gated in different manners are indicated by different symbols (circles: Continuous; square: Gated on/off 50 ms before/after the stimulus; leftward triangle: Gated on/off together synchronously with stimulus; rightward triangle: No noise). Subject S3 could not detect the lateralized target at 30 dB if the noise was gated synchronously with the stimulus and was, therefore, excluded from the calculation of the mean data.

Image of FIG. 4.
FIG. 4.

(Color online) Threshold ITD of SAM and transposed tones for different levels of the low-frequency noise as a function of stimulus level. The data are plotted in the same format as Fig. 1 . The two dark plotted conditions represent measurements re-plotted from Fig. 1 measured with a constant absolute noise level (56 dB SPL). The two lighter plotted conditions were measured with a constant relative noise level of (4 dB below signal level). For the 60 dB signal level, where both the constant noise and the relative noise have a level of 56 dB, the same data is utilized for both conditions.

Image of FIG. 5.
FIG. 5.

(Color online) Threshold ILD for different types of stimuli as a function of stimulus level. The data are plotted in the same format as Fig. 1 with the exception that open, rather than closed, symbols are employed.

Image of FIG. 6.
FIG. 6.

(Color online) Normalized threshold ITDs for SAM tones as a function of stimulus level. Mean data from Fig. 2 (two conditions; circles) are re-plotted together with mean threshold ITD data obtained in earlier studies. Fits of the current studies threshold ITD data are shown as dashed lines (for  = 128 Hz) and dashed-dotted lines ( = 32 Hz). Fits to the threshold ITD data of other studies are plotted as solid lines.

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/content/asa/journal/jasa/134/1/10.1121/1.4807827
2013-07-11
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The effect of overall level on sensitivity to interaural differences of time and level at high frequencies
http://aip.metastore.ingenta.com/content/asa/journal/jasa/134/1/10.1121/1.4807827
10.1121/1.4807827
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