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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...
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...
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.
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.

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Related Experiment Video

Updated: Jul 17, 2026

Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example
08:45

Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example

Published on: October 24, 2012

Spatiotemporal conversion of auditory information for cochleotopic mapping.

Osamu Hoshino1

  • 1Department of Intelligent Systems Engineering, Ibaraki University, Hitachi, Ibaraki, 316-8511 Japan. hoshino@mx.ibaraki.ac.jp

Neural Computation
|January 9, 2007
PubMed
Summary

Monkey calls, complex FM sounds, are processed by a novel cochleotopic map in the auditory cortex. This spatiotemporal conversion aids in identifying these signals, overcoming limitations of traditional delay line schemes.

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Published on: October 24, 2012

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Computational Neuroscience

Background:

  • Auditory communication signals like monkey calls are complex frequency-modulated (FM) sounds.
  • Neuronal timing in the primary auditory cortex is crucial for processing these signals.
  • Traditional delay line schemes struggle with signal intervals exceeding brain latency.

Discussion:

  • Proposes a cochleotopic map analogous to the visual retinotopic map.
  • Demonstrates mapping monkey call information onto spatiotemporal firing patterns.
  • Suggests spatiotemporal conversion is key for developing the cochleotopic map.

Key Insights:

  • Monkey calls can be mapped as spatiotemporal neuronal firing patterns.
  • These patterns decompose into simple FM components for higher-level processing.
  • The cochleotopic map facilitates unified percepts and signal identification.

Outlook:

  • The cochleotopic map serves as a foundation for advanced auditory processing.
  • This framework may be essential for monkey call identification by higher cortical areas.
  • Further research can explore the precise mechanisms of spatiotemporal conversion.