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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...

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.

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.

Somatosensation

Somatosensation

The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.

Auditory Perception

Auditory Perception

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...

Anatomy of the Ear

Anatomy of the Ear

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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Related Experiment Video

Updated: Mar 9, 2026

Assessment of Audio-Tactile Sensory Substitution Training in Participants with Profound Deafness Using the Event-Related Potential Technique

Assessment of Audio-Tactile Sensory Substitution Training in Participants with Profound Deafness Using the Event-Related Potential Technique

Published on: September 7, 2022

Task-specific reorganization of the auditory cortex in deaf humans.

Łukasz Bola^1,2, Maria Zimmermann^1,3, Piotr Mostowski⁴

¹Department of Psychology, Jagiellonian University, 30-060 Krakow, Poland.

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

|January 11, 2017

Summary

Deaf individuals show auditory cortex activation for visual tasks, demonstrating that the brain can adapt sensory input while maintaining task specificity. This suggests task-specific reorganization is a general principle of brain plasticity.

Keywords:

auditory cortex cross-modal plasticity fMRI perception sensory deprivation

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Area of Science:

Neuroscience
Cognitive Science
Sensory Plasticity

Background:

Cortical reorganization principles are not fully understood.
Visual cortex in blind individuals can adapt to auditory and tactile tasks, preserving function.
It is unknown if this task-specific plasticity applies beyond the visual cortex.

Purpose of the Study:

To investigate if auditory cortex in deaf individuals can be recruited for visual tasks.
To determine if task specificity is maintained in reorganized auditory cortex.
To explore general principles of cortical plasticity in humans.

Main Methods:

Functional MRI (fMRI) was used to scan 15 deaf and 15 hearing adults.
Participants discriminated complex rhythm sequences visually.
Hearing participants also performed the task auditorily for comparison.

Main Results:

Deaf subjects showed robust visual task activation in the auditory cortex, similar to hearing subjects' auditory task activation.
This activation in deaf individuals was concentrated in high-level auditory areas.
Increased functional connectivity between auditory and visual cortex was observed in deaf subjects during the visual task.

Conclusions:

The human auditory cortex can switch input modality from sound to vision in deaf individuals.
Task-specific activation patterns are preserved in the auditory cortex regardless of input modality.
Task-specific reorganization appears to be a general principle guiding cortical plasticity.