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Related Concept Videos

Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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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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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.
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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 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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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: Jul 19, 2025

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

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Composite receptive fields in the mouse auditory cortex.

Sihao Lu1, Grace W Y Ang1, Mark Steadman1

  • 1Department of Bioengineering, Imperial College London, London, UK.

The Journal of Physiology
|August 14, 2023
PubMed
Summary
This summary is machine-generated.

Auditory neurons in mice possess composite receptive fields, similar to songbirds. This suggests complex feature processing in auditory systems is a general trait, not unique to vocal learners.

Keywords:
UMAPauditory cortexreceptive fieldsparse filteringultrasonic vocalizations

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Area of Science:

  • Neuroscience
  • Auditory System Processing
  • Sensory Neuroscience

Background:

  • Understanding how neurons represent complex natural stimuli is a key question in sensory neuroscience.
  • Auditory neurons in songbirds exhibit composite receptive fields, but it's unknown if this is specific to vocal learners or a general property.

Purpose of the Study:

  • To investigate whether composite receptive fields are a generic property of central auditory systems.
  • To characterize auditory cortical neuron receptive fields in mice using natural vocalizations.

Main Methods:

  • Recorded responses from auditory cortical neurons in mice.
  • Used mouse ultrasonic vocalizations (USVs) and pitch-shifted starling songs as stimuli.
  • Applied sparse filtering and UMAP for feature analysis and comparison.

Main Results:

  • Mouse auditory cortical neurons display composite receptive fields with excitatory and inhibitory subunits for both conspecific and heterospecific vocalizations.
  • Receptive-field features from natural stimuli clustered together, as did sparse-filtering features, but natural and artificial features clustered separately.
  • The ethological relevance of stimuli influences the estimation of receptive-field dimensionality.

Conclusions:

  • Composite receptive fields are likely a generic property of central auditory systems, not unique to specialized vocal learners like songbirds.
  • These findings advance our understanding of neural representations of complex natural sounds.