Head movement has been shown to significantly improve localization response accuracy in elevation. It is unclear from previous research whether this is due to static cues created once the head has reached a new stationary position or dynamic cues created through the act of moving the head. In this experiment listeners were asked to report the location of loudspeakers placed on vertical planes at four different azimuth angles (0°, 36°, 72°, 108°) with no head movement. Static elevation response accuracy was significantly more accurate for sources away from the median plane. This finding, combined with the statement that listeners orient to face the source when localizing, suggests that dynamic cues are the cause of improved localization through head movement.
https://www.aes.org/e-lib/browse.cfm?elib=17193
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