Relationship between Accuracy and Direction of Sound Image Localization Using Narrowband Signal
In most cases of sound image localization, the direction is determined using ITD and ILD in the horizontal plane, and the spectral cue in the median plane. It has been also reported that the sufficient frequency bandwidth is required for stimuli to correctly localize in the horizontal plane. In this study, we investigate the relationship between accuracy and direction of sound image localization using narrowband signal; a sound image localization experiment using 1/3 octave band noise was performed in the horizontal plane. As a result, the narrow band signal lowers accuracy and causes a bias in the localization direction. These results strongly suggest that spectral cues may be more dominant than interaural information in the direction perception of narrowband signals.
