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Related Concept Videos

Auditory Pathway01:15

Auditory Pathway

6.4K
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.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
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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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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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Hair Cells01:22

Hair Cells

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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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Anatomy of the Ear01:16

Anatomy of the Ear

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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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Auditory Perception01:17

Auditory Perception

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The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the...
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Related Experiment Video

Updated: Nov 18, 2025

Stereotactically-guided Ablation of the Rat Auditory Cortex, and Localization of the Lesion in the Brain
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Stereotactically-guided Ablation of the Rat Auditory Cortex, and Localization of the Lesion in the Brain

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Deafness Weakens Interareal Couplings in the Auditory Cortex.

Prasandhya Astagiri Yusuf1,2,3, Peter Hubka2,3, Jochen Tillein2,3,4,5

  • 1Department of Medical Physics/Medical Technology Core Cluster IMERI, Faculty of Medicine, University of Indonesia, Jakarta, Indonesia.

Frontiers in Neuroscience
|February 8, 2021
PubMed
Summary
This summary is machine-generated.

Congenital deafness impairs functional connectivity in the auditory cortex. Developmental hearing experience is crucial for sensory processing and corticocortical interactions, especially top-down pathways.

Keywords:
bottom-upcochlear implantcongenital deafnesspredictive codingsynchronizationtop–down

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Sensory Processing

Background:

  • Cerebral cortex function relies on interareal functional assemblies.
  • Auditory cortex connectivity is vital for processing sound.
  • Developmental sensory experience shapes neural circuits.

Purpose of the Study:

  • Investigate the impact of developmental hearing experience on auditory cortex connectivity.
  • Examine functional and effective interareal connectivity in congenitally deaf cats (CDCs).
  • Compare connectivity in CDCs versus hearing controls.

Main Methods:

  • Used intracortical multielectrode arrays to record neuronal activity.
  • Studied primary auditory cortex and posterior auditory field (PAF).
  • Analyzed ongoing and stimulus-evoked activity using pairwise phase consistency and Granger causality.

Main Results:

  • Number of coupled sites was similar between controls and CDCs.
  • CDCs showed reduced coupling strength between primary and higher-order auditory fields during stimulation.
  • Stimulus-related decoupling was prominent in the alpha band and top-down direction.

Conclusions:

  • Developmental experience is essential for functional interareal interactions during sensory processing.
  • Congenital sensory deprivation compromises corticocortical couplings, particularly top-down connectivity.
  • Auditory cortex functional connectivity is shaped by early-life hearing experience.