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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.

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Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea

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Auditory cortical field coding long-lasting tonal offsets in mice.

Hironori Baba^1,2, Hiroaki Tsukano¹, Ryuichi Hishida¹

¹Department of Neurophysiology, Brain Research Institute, Niigata University, 1-757 Asahi-machi, Chuo-ku, Niigata 951-8585, Japan.

Scientific Reports

|October 1, 2016

Summary

Researchers identified a specific auditory cortical field in mice that responds to the offset of long-lasting sounds. This discovery sheds light on how the brain processes temporal information in auditory perception.

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Last Updated: Mar 14, 2026

Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea

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Published on: May 10, 2019

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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

Area of Science:

Neuroscience
Auditory Perception
Sensory Processing

Background:

Temporal information processing is crucial for auditory perception.
Mechanisms for coding tonal offsets in the auditory cortex remain largely unknown.

Purpose of the Study:

To investigate cortical responses to tonal stimulus offsets.
To identify brain regions involved in processing auditory temporal information.

Main Methods:

Utilized flavoprotein fluorescence imaging and two-photon calcium imaging in mice.
Examined cortical responses to tonal stimuli of varying durations (1s and 7s).
Investigated the role of NMDA receptors using MK-801.

Main Results:

Off-responses were observed at the offset of 7s tonal stimuli, but not 1s stimuli.
Off-responses to short stimuli were induced by preceding longer stimuli.
NMDA receptor inhibition suppressed these off-responses.
A specific auditory cortical field adjacent to the primary auditory cortex showed significant off-responses to long stimuli.

Conclusions:

An auditory cortical field responsive to long-lasting tonal offsets exists.
This field may play a role in temporal information processing.
NMDA receptor-dependent disinhibition might underlie these off-responses.