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Related Concept Videos

The Cochlea01:13

The Cochlea

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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
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Related Experiment Video

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A Method to Study Adaptation to Left-Right Reversed Audition
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Development of a method for determining binaural sensitivity to temporal fine structure.

Christian Füllgrabe1, Andrew J Harland2, Aleksander P Sęk2,3

  • 1a Medical Research Council Institute of Hearing Research, School of Medicine , The University of Nottingham , Nottingham , UK.

International Journal of Audiology
|September 2, 2017
PubMed
Summary

A new test effectively measures binaural temporal-fine-structure (TFS) processing in listeners with normal hearing. The TFS-AF test shows no practice effects and correlates well with existing measures, aiding in assessing supra-threshold binaural processing.

Keywords:
Psychoacoustics/hearing scienceadult or general hearing screeningagingbehavioural measures

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Audiology

Background:

  • Binaural temporal-fine-structure (TFS) processing is crucial for sound localization and speech perception.
  • Existing tests may not adequately capture supra-threshold TFS sensitivity across all listener groups.

Purpose of the Study:

  • To develop and validate a novel test, the TFS-AF test, for assessing binaural TFS processing.
  • To provide a graded measure of TFS sensitivity suitable for all listeners, including those with hearing impairments.

Main Methods:

  • The TFS-AF test adaptively varied frequency with a fixed interaural phase difference (IPD), ranging from 30 to 180 degrees.
  • Sensitivity was assessed at 30 dB sensation level across center frequencies of 250, 500, and 750 Hz.
  • The new test was evaluated on young and older adults with normal hearing.

Main Results:

  • Young listeners showed no significant improvement with repeated TFS-AF testing, indicating minimal practice effects.
  • Listener performance rankings were consistent across different IPD sizes.
  • Strong correlations were found between the TFS-AF and TFS-LF tests.
  • Older listeners who failed the TFS-LF test could complete the TFS-AF test.

Conclusions:

  • The TFS-AF test demonstrates reliability and minimal practice effects, making it suitable for assessing supra-threshold binaural processing.
  • Its ability to accommodate listeners who struggle with existing tests highlights its clinical utility.
  • The test serves as a valuable tool for evaluating binaural hearing capabilities.