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Lateralization of a moving auditory image: interrelation of interaural time and intensity differences
J A Altman1, O V Variaguina, N I Nikitin
1Laboratory of Hearing Physiology, I. P. Pavlov Institute of Physiology, Russian Academy of Sciences, Saint Petersburg, Russia. altman@infran.ru
The Journal of the Acoustical Society of America
|January 28, 1999
Summary
Interaural intensity difference (IID) significantly influences the perceived location of moving fused auditory images (FAIs). Increased IID shifts FAI trajectories towards the more intense sound, demonstrating IID
Area of Science:
- Auditory perception
- Psychoacoustics
- Neuroscience
Background:
- Investigating the spatial perception of sound is crucial for understanding auditory processing.
- Fused auditory images (FAIs) represent a complex auditory phenomenon influenced by binaural cues.
- Lateralization, the perceived left-right position of a sound, is primarily determined by interaural differences.
Purpose of the Study:
- To examine the effect of interaural intensity difference (IID) on the lateralization of moving fused auditory images (FAIs).
- To quantify the relationship between IID and the perceived trajectory of FAIs.
- To compare the influence of IID with interaural time delay (ITD) on FAI movement.
Main Methods:
- Subjects perceived moving FAIs generated by gradually changing interaural time delay (ITD) in click trains.
- A constant interaural intensity difference (IID) was applied, ranging from +/- 13 dB.
- Participants indicated the perceived start and end points of the FAI movement trajectory on their head surface.
Main Results:
- FAI movement trajectories shifted towards the ear with the more intense stimulus as IID increased.
- The length of the FAI movement trajectory decreased with increasing IID.
- Linear functions described the relationship between perceived lateral position and IID, with different characteristics for leftward vs. rightward movement.
Conclusions:
- IID is a significant factor in the lateralization of moving auditory images.
- The perceived trajectory of FAIs is dynamically influenced by IID, showing a directional shift and altered length.
- IID was found to be substantially more effective than ITD in influencing the lateralization of moving FAIs.