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Related Concept Videos

Auditory Pathway01:15

Auditory Pathway

5.8K
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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The Cochlea01:13

The Cochlea

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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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Hair Cells01:22

Hair Cells

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Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
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Related Experiment Video

Updated: Sep 15, 2025

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Layer 6 is a hub for cholinergic modulation in the mouse auditory cortex.

Lucas G Vattino1,2,3, Kameron K Clayton1,2,3, Troy A Hackett4,3

  • 1Eaton-Peabody Laboratories, Massachusetts Eye and Ear, Boston, MA, 02114, USA.

Biorxiv : the Preprint Server for Biology
|July 15, 2025
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Summary

Basal forebrain cholinergic neurons modulate auditory cortex circuits. They target layer 1 inhibitory and layer 6 excitatory neurons, influencing perception and plasticity on different timescales.

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Area of Science:

  • Neuroscience
  • Auditory Cortex Research
  • Cholinergic System

Background:

  • Basal forebrain cholinergic neurons (BFCNs) extensively innervate the auditory cortex (ACtx).
  • Acetylcholine (ACh) rapidly modulates cortical circuits via nicotinic ACh receptors (nAChRs) on layer 1 inhibitory neurons.
  • Cholinergic modulation in deeper cortical layers, particularly layer 6 (L6), is less understood.

Purpose of the Study:

  • Investigate the mechanisms and functional consequences of BFCN modulation in L6 of the auditory cortex.
  • Identify key neuronal populations mediating BFCN effects across cortical layers.
  • Determine how cholinergic inputs shape cortical processing and plasticity.

Main Methods:

  • Multi-plex in situ labeling to identify receptor expression in different cortical layers and cell types.
  • In vivo optogenetic activation of BFCN axons to study neuronal responses.
  • Acute slice electrophysiology to record synaptic responses in target neurons.

Main Results:

  • L6 pyramidal neurons (L6-PNs) show high expression of nAChR and muscarinic ACh receptor (mAChR) transcripts.
  • BFCN activation caused persistent modulation in L2-6 units and rapid phasic activation in L6.
  • Optogenetic BFCN stimulation induced fast nAChR-mediated excitation in L6-PNs and slower mAChR-mediated inhibition.

Conclusions:

  • L1 inhibitory neurons and L6 excitatory neurons are key hubs for BFCN modulation of the auditory cortex.
  • Distinct receptor expression and response kinetics in L1 and L6 suggest differential roles in shaping perception and plasticity.
  • Cholinergic system differentially impacts cortical circuits across layers, potentially on varying timescales.