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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.

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...

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.

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Related Experiment Video

Updated: May 17, 2026

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

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

Published on: October 11, 2017

Sensitivity to complex statistical regularities in rat auditory cortex.

Amit Yaron¹, Itai Hershenhoren, Israel Nelken

¹Department of Neurobiology, Institute of Life Sciences, Jerusalem 91904, Israel.

|November 13, 2012

Summary

This summary is machine-generated.

Neurons in the auditory cortex show enhanced responses to rare sounds. This study reveals they also detect patterns in sound sequences, responding less to predictable tones.

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Functional Imaging of Auditory Cortex in Adult Cats using High-field fMRI

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Published on: February 19, 2014

Area of Science:

Neuroscience
Auditory Perception
Neural Coding

Background:

Auditory cortex neurons are known to respond differently to stimulus probability.
Previous research indicates stronger neural responses to rare stimuli compared to common ones.

Purpose of the Study:

To investigate finer sensitivity of auditory cortex neurons to the structure of sound sequences.
To determine if neural responses are influenced by the predictability and complexity of auditory patterns.

Main Methods:

Intra- and extracellular recordings were performed in the auditory cortex of halothane-anesthetized rats.
Oddball sequences with periodic stimulus presentation were used to test neural responses.
Responses to tones in periodic sequences were compared with responses to tones in random sequences.

Main Results:

Neurons in the auditory cortex exhibited reduced responses to tones presented in periodic sequences compared to random sequences.
This response reduction was significant even when common tones constituted 95% of the stimuli.
The degree of response reduction correlated with the complexity of the sound sequences.

Conclusions:

Auditory cortex neurons possess a sophisticated sensitivity to the detailed structure of sound sequences.
This sensitivity extends beyond simple probability detection, operating over timescales of minutes.
Neural processing in the auditory cortex adapts to predictable auditory patterns, modulating responses accordingly.