Auditory localization under conflicting dynamic and spectral cues was investigated in a listening experiment where head-motion-coupled amplitude panning was used to create front-back confusions with moving free-field stimuli. Subjects reported whether stimuli of various spectra formed auditory images in the front, rear or both hemiplanes simultaneously. The results show that panned low-pass stimuli were consistently localized to the rear hemiplane while high-pass stimuli did not produce hemiplane reversals. The main result of the experiment is that broadband stimuli providing low-frequency ITD sequences that are inconsistent with the source directions implied by the spectral cues can lead to the formation of two segregated auditory images. This effect was observed with both continuous and discontinuous stimulus spectra.
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