Abstract
The tone localization experiments reported by Macaulay and Hartmann [J. Acoust. Soc. Am. 149, 4159–4179 (2021)] were highly biased in favor of sources in front of the listener. Nevertheless, listeners sometimes localized tones in back, both when they were stationary and when they were required to move. The experiments provided extensive data relevant to the matter of in-back localization, because they measured head location and orientation as well as ear canal signals throughout each experiment trial. Because the experiments were done in a room, the data were irregular functions of source azimuth. Analysis revealed the following effects: For stationary trials, back responses were strongly correlated with weaker tone levels in the ear canals for 500, 2000, and 4000 Hz. Correlation was greatly reduced at 1000 Hz. That result is consistent with head-related transfer functions, where ear-canal intensity is greater for sounds in front except near 1000 Hz. For moving trials, back responses at 500 and 1000 Hz were strongly correlated with the slopes of interaural level differences and interaural time differences as functions of head-pointing direction, as naturally occur in free field. Correlations decreased dramatically at higher frequencies.
Published Version
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