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Related Concept Videos

Perceiving Loudness, Pitch, and Location01:21

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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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Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
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The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
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Related Experiment Video

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Optogenetic Stimulation of the Auditory Nerve
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Abnormal pitch perception produced by cochlear implant stimulation.

Fan-Gang Zeng1, Qing Tang1, Thomas Lu1

  • 1Center for Hearing Research, Departments of Anatomy and Neurobiology, Biomedical Engineering, Cognitive Sciences, and Otolaryngology - Head and Neck Surgery, University of California Irvine, Irvine, California, United States of America.

Plos One
|February 20, 2014
PubMed
Summary

Cochlear implants struggle with music due to poor electric pitch perception. This study reveals significant abnormalities in electric pitch processing, showing it

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Area of Science:

  • Auditory Neuroscience
  • Biomedical Engineering
  • Speech and Hearing Sciences

Background:

  • Contemporary cochlear implants (CIs) offer good speech but poor music perception.
  • Quantifying electric pitch perception is challenging, limiting understanding of CI performance deficits.

Purpose of the Study:

  • To investigate electric pitch perception abnormalities in cochlear implant users.
  • To compare electric pitch with acoustic pitch perception to establish a gold standard for electric pitch quantification.

Main Methods:

  • Compared acoustic and electric pitch perception in three unilateral CI subjects with usable acoustic hearing.
  • Measured pure tone frequency discrimination and melody recognition in the acoustic ear.
  • Matched electric pitch from intra-cochlear electrodes to acoustic pure tones to derive the frequency-electrode function and frequency difference limens.

Main Results:

  • Acoustic ears showed slightly impaired frequency discrimination and near-perfect melody recognition.
  • The electric frequency-electrode function was 1-2 octaves lower and 2 times more compressed than the normal cochlear frequency-place function.
  • Electric frequency discrimination was 24 times worse than in normal-hearing controls, indicating significant pitch abnormalities.

Conclusions:

  • Abnormalities in electric pitch perception, including reduced frequency discrimination, are inherent to the CI electrode-nerve interface.
  • The large variance in the frequency-electrode function, not just its mean shape, is the primary factor limiting CI performance, especially for music perception.