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The lateralization of simple dichotic pitches
1MRC Institute of Hearing Research, University Park, Nottingham, United Kingdom. michael@neuron.uchc.edu
The Journal of the Acoustical Society of America
|August 3, 2000
Summary
This study explores how "simple" dichotic pitches are perceived. The research found that the pitch's lateralization depends on the broadband noise's configuration and the narrow band's frequency and interaural properties.
Area of Science:
- Auditory Perception
- Psychoacoustics
- Computational Auditory Neuroscience
Background:
- Dichotic pitches are auditory phenomena arising from specific interaural configurations.
- Understanding the factors influencing dichotic pitch lateralization is crucial for auditory modeling.
Purpose of the Study:
- To investigate the determinants of lateralization for simple dichotic pitches.
- To evaluate the predictive capabilities of computational models for dichotic pitch perception.
Main Methods:
- Creation of dichotic pitches by manipulating interaural decorrelation or time differences in narrow bands within broadband noise.
- Utilizing an adaptive forced-choice procedure for listeners to match lateralization.
- Evaluating two computational models: a central-spectrum model and a novel reconstruction-comparison model.
Main Results:
- Lateralization was primarily determined by the broadband noise's interaural configuration and the narrow band's center frequency (Experiment 1).
- The narrow band's interaural configuration significantly influenced lateralization (Experiment 2).
- The central-spectrum model partially predicted results, while the reconstruction-comparison model accurately accounted for findings in both experiments.
Conclusions:
- The reconstruction-comparison model offers a better framework for understanding dichotic pitch lateralization by segregating and comparing cross-correlational information.
- Auditory processing involves complex mechanisms for separating and analyzing interaural cues in complex soundscapes.