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Temporal weighting functions for interaural time and level differences. III. Temporal weighting for lateral position
G Christopher Stecker1, Jennifer D Ostreicher, Andrew D Brown
1Department of Speech and Hearing Sciences, University of Washington, 1417 NE 42nd Street, Seattle, Washington 98105, USA. cstecker@spatialhearing.org
The Journal of the Acoustical Society of America
|August 10, 2013
Summary
Listeners
Area of Science:
- Auditory perception
- Psychoacoustics
- Binaural hearing
Background:
- Listeners' sensitivity to sound localization cues varies over time.
- The temporal weighting function (TWF) paradigm assesses this sensitivity.
Purpose of the Study:
- To investigate temporal variations in sensitivity to interaural time differences (ITD) and interaural level differences (ILD).
- To examine how ITD and ILD interact in influencing sound-source lateralization.
- To measure TWFs under various ITD and ILD conditions.
Main Methods:
- Used the TWF paradigm with Gabor click trains presented binaurally.
- Varied overall ITD and ILD across trials, with click-by-click variations for TWF calculation.
- Measured TWFs for ITD alone, ILD alone, covarying ITD/ILD, and independently varying ITD/ILD.
Main Results:
- TWFs showed high weight on the first click for short interclick intervals (ICI = 2 ms), and flatter weighting for longer ICIs (5-10 ms).
- A greater weighting for later clicks was observed when ILD was present, particularly for a 5 ms ICI.
- This late weighting effect was specific to conditions with ILD present.
Conclusions:
- Temporal weighting in sound lateralization is influenced by interaural differences.
- The presence of ILD can shift auditory system's temporal focus towards later parts of a sound.
- Findings highlight the dynamic nature of binaural cue integration in auditory perception.
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