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Related Concept Videos

Hearing01:31

Hearing

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When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
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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 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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Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
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Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...
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Functional Imaging of Auditory Cortex in Adult Cats using High-field fMRI
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Harmonic template neurons in primate auditory cortex underlying complex sound processing.

Lei Feng1, Xiaoqin Wang2

  • 1Laboratory of Auditory Neurophysiology, Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, MD 21205.

Proceedings of the National Academy of Sciences of the United States of America
|January 19, 2017
PubMed
Summary
This summary is machine-generated.

Researchers discovered harmonic template neurons in the auditory cortex of marmosets. These neurons help process complex sounds like speech and music by detecting harmonic structures.

Keywords:
auditory cortexharmonichearingmarmosetmusic

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Primate Auditory Cortex Research

Background:

  • Harmonicity is crucial for perceiving music, speech, and animal vocalizations.
  • The neural mechanisms by which the auditory system extracts harmonic structures remain largely unknown.
  • Understanding primate auditory cortex function is key to deciphering complex sound processing.

Purpose of the Study:

  • To investigate the neural mechanisms underlying harmonic structure extraction in the primate auditory cortex.
  • To identify specific neural populations responsible for processing biologically relevant acoustic structures.
  • To explore how the auditory system forms a coherent perception of harmonically rich sounds.

Main Methods:

  • Electrophysiological recordings in the auditory cortex of the common marmoset (Callithrix jacchus).
  • Presentation of harmonic and inharmonic complex sounds to assess neuronal responses.
  • Analysis of neuronal selectivity for harmonic number and spectral regularity.

Main Results:

  • Discovery of a unique class of harmonic template neurons across the marmoset auditory cortex.
  • These neurons exhibit nonlinear facilitation to harmonic over inharmonic sounds.
  • Neurons show selectivity for specific harmonic structures, harmonic number, and spectral regularity.

Conclusions:

  • Harmonic template neurons in the auditory cortex play a significant role in processing sounds with harmonic structures.
  • These findings offer insights into the neural basis of perceiving animal vocalizations, human speech, and music.
  • The common marmoset serves as a valuable model for studying auditory processing relevant to humans.