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Related Concept Videos

Auditory Pathway01:15

Auditory Pathway

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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...
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Motor and Sensory Areas of the Cortex01:14

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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.
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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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Association Areas of the Cortex01:21

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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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Auditory Perception01:17

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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...
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Somatosensory, Motor, and Association Cortex01:24

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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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Related Experiment Video

Updated: May 16, 2025

Stereotactically-guided Ablation of the Rat Auditory Cortex, and Localization of the Lesion in the Brain
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The cingulate cortex facilitates auditory perception under challenging listening conditions.

Kelsey L Anbuhl1,2, Marielisa Diez Castro1, Nikki A Lee1

  • 1Center for Neural Science, New York University, New York, NY 10003.

Proceedings of the National Academy of Sciences of the United States of America
|April 1, 2025
PubMed
Summary
This summary is machine-generated.

The cingulate cortex (Cg) helps the auditory cortex (AC) improve listening performance in challenging conditions. This descending pathway aids perception when hearing is difficult.

Keywords:
auditory cortexauditory perceptioncingulate cortexlistening effort

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Cognitive Neuroscience

Background:

  • Listening effort increases cognitive load, especially with hearing loss.
  • The cingulate cortex may modulate auditory processing during difficult listening.
  • Neural mechanisms of listening effort are not fully understood.

Purpose of the Study:

  • Investigate if the gerbil cingulate cortex (Cg) projects to the auditory cortex (AC).
  • Determine if this pathway aids perceptual performance under challenging acoustic conditions.

Main Methods:

  • Used a sound discrimination task in gerbils with "Easy" and "Hard" blocks.
  • Performed anatomical tracing to identify Cg-AC projections.
  • Inactivated Cg1 using muscimol and chemogenetics to assess performance changes.

Main Results:

  • Gerbils showed similar performance in Easy and Hard blocks initially.
  • A strong descending projection from Cg1 to AC was identified.
  • Inactivation of Cg1 selectively impaired performance in Hard blocks.

Conclusions:

  • A descending pathway from the cingulate cortex to the auditory cortex facilitates perceptual performance.
  • This pathway is crucial for overcoming challenging listening conditions.