| Autor: |
Rice, J. Jeremy, May, Brad, Spirou, George A., Young, Eric D. |
| Zdroj: |
Journal of the Acoustical Society of America; 1989, Vol. 85 Issue S1, pS67-S67, 1p |
| Abstrakt: |
The directional dependence of the transfer function from free-field plane waves to a point near the tympanic membrane was measured in anesthetized domestic cats. A probe tube microphone was placed from a ventral approach, which minimally affects the head and pinae. Acoustic measurements were taken using a quasianechoic method in which an impulsive stimulus was presented and room reflections were rejected using a Kaiser window. The transfer functions are similar to those reported earlier [A.D. Musicant et al., 12th ICA, Toronto (July 1986)]. They can be broken into three distinct frequency ranges: A low-frequency range (< 5 kHz), where interaural level differences vary smoothly with azimuth; a midfrequency range (5-18 kHz), where a prominent spectral notch is observed; and a high-frequency range (> 18 kHz), where the spectrum varies greatly with source location. The frequency of the midfrequency notch is a robust cue for sound source direction; it varies with both azimuth and elevation in a monotonic fashion in the frontal field. Source direction is uniquely determined by combining the midfrequency notch cue from both ears. These results suggest that simple consideration of interaural level differences may not be sufficient for the study of sound localization at high frequencies. [Work supported by Grant No. NS12524 from NINCDS/NIDCD.] [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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