Abstract
Asano et al. [J. Acoust. Soc. Am. 88, 159–168 (1990)] demonstrated that localization is not accurate for the simulation of sound sources on the median plane when the low-frequency component of head related transfer functions (HRTFs) are smoothed. In the present localization experiment, the low- and high-frequency components of white-noise stimuli were separated at fc=4.8 kHz (−48 dB/oct.). Those components were independently presented from different directions. Results show that the sound image is localized in the direction from which the high-frequency component is presented, regardless of the direction of low-frequency component, showing that the low-frequency component has no evident effect on the sound localization on a median plane. Based on the results of these two experiments, it is concluded that only the high-frequency component of an HRTF provides spectral cues for sound localization on a median plane. However, changing the low-frequency component of the HRTF, which is unlikely to naturally occur in sound localization on a median plane, may interfere with accurate localization.
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