Listeners placed in an acoustically and visually neutral environment were required to localize sounds presented by means of loudspeakers. Convincing in-head and external image localizations were observed separately and in combination. The amount of in-head localization was found to change substantially and systematically with changes in signal bandwidth and source position. Signal type and center frequency had less effect. It was concluded that small head movements are not the main factor underlying the “externalization” of sounds.
Lateralization-judgment trajectories with interaural time delay of acoustic images arising binaurally arereported for certain multicomponent signals such as multiple tones and repetitive transients. It is shown that certain multiple sound images simultaneously perceived may be independently lateralized and the characteristic judgment trajectories manipulated predictably in various ways. With repetitive binaural transients, the dominant, impulsive, image is shown to be accompanied by tonal images due to harmonics but it is argued that the impulsive image does not arise as a synthesis of the harmonic tonal images. Highand low-pitched impulsive images appear to be related to individual acoustic transients and apparently arise by virtue of neural activity in two different regions of the cochlea.
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