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Auditory Pathway

Auditory Pathway

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 the...

The Cochlea

The Cochlea

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.

Hearing

Hearing

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.

Unrenewable Cells

Unrenewable Cells

In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of their outer...

Hair Cells

Hair Cells

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.

Long-term Potentiation

Long-term Potentiation

Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.

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Related Experiment Video

Updated: Jul 16, 2026

Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss

Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss

Published on: January 25, 2016

Developmental hearing loss eliminates long-term potentiation in the auditory cortex.

Vibhakar C Kotak¹, Andrew D Breithaupt, Dan H Sanes

¹Center for Neural Science and Department of Biology, New York University, New York, NY 10003, USA.

Proceedings of the National Academy of Sciences of the United States of America

|March 16, 2007

Summary

Early hearing loss impairs synaptic plasticity in the auditory cortex. Normal auditory experience is crucial for developing long-term potentiation (LTP) and long-term depression (LTD) mechanisms.

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Area of Science:

Neuroscience
Auditory Neuroscience
Developmental Neuroscience

Background:

Severe hearing loss in early development can hinder speech and language acquisition.
Previous studies suggest deafness alters synaptic strength, but the role of auditory experience in long-term synaptic plasticity remains unclear.

Purpose of the Study:

To investigate whether long-term synaptic plasticity in the auditory cortex depends on auditory experience.
To examine the effects of sensorineural hearing loss (SNHL) on excitatory synaptic plasticity in developing gerbils.

Main Methods:

Sensorineural hearing loss (SNHL) was surgically induced in developing gerbils at postnatal day 10.
Excitatory synaptic plasticity was assessed in brain slices of the auditory cortex.
Extracellular stimuli were applied to layer 6 (L6), and excitatory synaptic potentials (EPSPs) were recorded from layer 5 (L5) neurons.

Main Results:

Control neurons exhibited both long-term potentiation (LTP) and long-term depression (LTD) after conditioning stimulation.
Neurons from SNHL gerbils showed only LTD.
Prehearing control neurons predominantly displayed LTD.

Conclusions:

Normal auditory experience is essential for the proper maturation of synaptic plasticity mechanisms in the auditory cortex.
Auditory deprivation during development may impair the ability to establish LTP, favoring LTD.