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A model for sound lateralization.

V Aharonson¹, M Furst

¹Department of Electrical Engineering-Systems, Faculty of Engineering, Tel Aviv University, Israel. vered@eng.tau.ac.il

The Journal of the Acoustical Society of America

|June 27, 2001

Summary

Brainstem lesions in multiple sclerosis (MS) and stroke patients correlate with altered binaural hearing. Lesion location affects perception of interaural time and level differences, impacting sound localization.

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Area of Science:

Neuroscience
Auditory Neuroscience
Computational Neuroscience

Background:

Studies suggest a link between pontine lesion location and abnormal binaural hearing in MS and stroke patients.
Specific lesion sites correlate with distinct patterns of interaural difference perception.

Purpose of the Study:

To propose and model a hierarchical brainstem structure for estimating interaural time differences (ITD) and interaural level differences (ILD).
To investigate the relationship between pontine lesion location and binaural processing deficits.

Main Methods:

Simulated auditory nerve responses to broadband stimuli.
A multi-level hierarchical model of the brainstem processing ITD and ILD.
Modeling neural arrays performing logical and arithmetic functions at different hierarchical levels.

Main Results:

Simulations demonstrated good correspondence with observed effects of pontine lesion locations on binaural performance.
Lesions below or at the superior olivary complex (SOC) were associated with perceiving small interaural differences.
Lesions above the SOC were associated with perceiving large interaural differences.

Conclusions:

The proposed hierarchical brainstem model effectively explains the impact of pontine lesion location on binaural hearing.
The model supports a functional division within the brainstem for processing binaural cues.
Findings advance understanding of auditory processing and neurological disorders affecting the brainstem.

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