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An Automated System for Sound Localization Testing in Hearing-Impaired Listeners
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Sound localization.

John C Middlebrooks1

  • 1Departments of Otolaryngology, Neurobiology and Behavior, Cognitive Sciences, and Biomedical Engineering, University of California at Irvine, Irvine, CA, USA.

Handbook of Clinical Neurology
|March 2, 2015
PubMed
Summary
This summary is machine-generated.

The auditory system uses head and ear interactions to determine sound locations via brainstem and cortical pathways. Key cues include interaural time/level differences and spectral shapes, with the auditory cortex crucial for spatial representation.

Keywords:
HRTFSpatial hearingauditory cortexauditory motiondistance perceptioninteraural level differenceinteraural time differenceprecedence effectsuperior colliculussuperior olivary complex

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Acoustic Signal Processing

Background:

  • Sound localization relies on spatial cues from sound interacting with the head and ears.
  • These cues are processed in brainstem pathways before cortical integration.
  • Horizontal localization uses interaural time differences (ITDs) and interaural level differences (ILDs).

Purpose of the Study:

  • To review the mechanisms of sound localization.
  • To identify the neural pathways involved in analyzing spatial auditory cues.
  • To discuss the role of the auditory cortex in representing sound locations.

Main Methods:

  • Review of existing literature on auditory spatial processing.
  • Analysis of neural pathways in the brainstem (MSO, LSO, DCN).
  • Examination of cortical representation of sound locations.

Main Results:

  • Medial superior olive (MSO) likely analyzes ITDs, lateral superior olive (LSO) analyzes ILDs, and dorsal cochlear nucleus (DCN) analyzes spectral cues.
  • Distance localization is less accurate and influenced by environmental factors.
  • Auditory cortex is essential, with a distributed, contralateral representation (prominent right-hemisphere dominance in humans).

Conclusions:

  • Sound localization involves complex analysis of acoustic cues in the brainstem and integration in the auditory cortex.
  • The precise mechanisms for sound motion detection remain unclear.
  • Cortical spatial representation is contralateral, with lateralization observed in humans.