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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...

Association Areas of the Cortex

Association Areas of the Cortex

Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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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.

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...

Motor and Sensory Areas of the Cortex

Motor and Sensory Areas of the Cortex

The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex....

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Related Experiment Video

Updated: Feb 24, 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

Auditory-cortex lesions impair contralateral tone-pattern detection under informational masking.

Lisa Prilop¹, Alexander Gutschalk¹

¹Department of Neurology, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior

|August 15, 2017

Summary

Unilateral auditory cortex lesions impair hearing in the opposite ear, especially during complex listening tasks. This suggests broader neural processing issues beyond direct frequency competition contribute to hearing deficits.

Keywords:

Auditory scene analysis Extinction Multi-tone masking Neglect Stream segregation

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Last Updated: Feb 24, 2026

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

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Published on: October 11, 2017

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Mapping the After-effects of Theta Burst Stimulation on the Human Auditory Cortex with Functional Imaging

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Published on: September 12, 2012

Area of Science:

Neuroscience
Auditory Neuroscience
Clinical Auditory Research

Background:

Hearing impairment contralateral to unilateral auditory cortex lesions is typically seen only during perceptual competition.
The underlying neural mechanisms, whether direct frequency-specific neuronal competition or broader processing load, remain unclear.

Purpose of the Study:

To investigate if enhanced processing load in distant frequencies contributes to impaired auditory detection in patients with unilateral auditory cortex lesions.
To evaluate the impact of unilateral auditory cortex lesions on monaural target detection under informational masking.

Main Methods:

Studied patients (N=14) with unilateral auditory cortex lesions (left/right hemispheric) and a control group (N=25).
Employed a target-detection task with a multi-tone masker to induce informational masking.
Measured target detection sensitivity in the monaural contra-lesional ear.

Main Results:

Patients with unilateral auditory cortex lesions showed reduced sensitivity for monaural target streams in the contra-lesional ear (approx. 10% higher error rate).
A subgroup with auditory neglect exhibited a general bilateral reduction in target detection.
Auditory cortex lesions impair contra-lesional target detection under informational masking.

Conclusions:

Unilateral auditory cortex lesions impair monaural, contra-lesional target detection under informational masking.
Findings support the hypothesis that neural mechanisms beyond direct frequency-specific competition contribute to hearing impairment under perceptual competition.