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Related Concept Videos

The Cochlea01:13

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.
Auditory Pathway01:15

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 the...
Hearing01:31

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.
Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...
Hair Cells01:22

Hair Cells

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.
Anatomy of the Ear01:16

Anatomy of the Ear

Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...

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Related Experiment Video

Updated: Jun 10, 2026

A Method for Tracking the Time Evolution of Steady-State Evoked Potentials
12:03

A Method for Tracking the Time Evolution of Steady-State Evoked Potentials

Published on: May 25, 2019

A physiologically based model for temporal envelope encoding in human primary auditory cortex.

Pierre Dugué1, Régine Le Bouquin-Jeannès, Jean-Marc Edeline

  • 1INSERM, U 642, Rennes F-35000, France.

Hearing Research
|August 6, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a new computational model of the human auditory pathway, simulating responses to sound modulation. The model accurately captures temporal modulation transfer functions (TMTFs) across the entire auditory system.

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Area of Science:

  • Auditory Neuroscience
  • Computational Auditory Neuroscience
  • Speech Processing

Background:

  • Human speech contains prominent temporal modulations (2-16 Hz).
  • Previous models of the auditory pathway were limited in scope, either focusing on lower stages or the thalamocortical loop.
  • Understanding auditory processing of temporal envelope fluctuations is crucial for speech comprehension.

Purpose of the Study:

  • To propose and validate a new phenomenological model of the entire human auditory pathway.
  • To simulate auditory responses to amplitude-modulated white noise.
  • To reproduce diverse temporal modulation transfer functions (TMTFs) observed in human subjects.

Main Methods:

  • Developed a two-stage computational model of the auditory pathway (outer ear to primary auditory cortex).
  • Incorporated anatomical and physiological findings, including inhibitory interneurons and thalamocortical connections.
  • Quantified model performance using temporal modulation transfer functions (TMTFs) and optimized parameters against human data.

Main Results:

  • The model successfully simulates responses to amplitude-modulated stimuli across the auditory pathway.
  • Optimized model parameters reproduced the diversity of human TMTFs.
  • A patient-specific model was derived, accurately capturing spontaneous and evoked neural activity.

Conclusions:

  • The proposed model provides a comprehensive simulation of the human auditory pathway's response to temporal modulations.
  • This model can be used to understand individual differences in auditory processing and potentially for clinical applications.
  • The findings advance our understanding of neural coding of temporal envelope fluctuations in speech and sound.