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The effects of perceived motion on sound-source lateralization
J K Cullen1, M J Collins, T G Dobie
1Louisiana State University, Baton Rouge 70803-2606.
Aviation, Space, and Environmental Medicine
|June 11, 1992
Summary
Motion, like angular acceleration, impairs sound localization. This study found that real or apparent motion negatively impacts the brain's ability to use binaural time differences for determining sound source location.
Area of Science:
- Auditory Neuroscience
- Human Auditory Perception
- Vestibular System
Background:
- Sound source localization relies heavily on binaural time differences (BTDs).
- Understanding how motion affects auditory processing is crucial for real-world applications, such as driving.
Purpose of the Study:
- To investigate the impact of motion conditions on the perception of dichotic click pairs differing in onset time.
- To assess how angular acceleration and optokinetic stimulation affect sound localization performance.
Main Methods:
- Dichotic listening tasks with click pairs varying in onset time were administered.
- Experimental conditions included angular acceleration, optokinetic stimulation, and gaze fixation.
- Performance was compared against control conditions with no induced motion.
Main Results:
- Poorer left-right judgment accuracy was observed for small time differences under motion conditions.
- Subjective simultaneity judgments were shifted during experimental conditions.
- Response times for auditory localization tasks increased significantly with motion.
Conclusions:
- Real or apparent motion interferes with the processing of binaural time differences.
- Auditory localization capabilities, particularly those relying on BTDs, are compromised during motion.
- Findings have implications for understanding auditory perception in dynamic environments like vehicles.