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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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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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Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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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.
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Hearing01:31

Hearing

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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

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Multiscale Investigations of Cortical Processing by Integrating Laminar Polytrodes and Optogenetics with Micro Electrocorticography in Rodents
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Physiological Evidence for a Midline Spatial Channel in Human Auditory Cortex.

Paul M Briley1, Adele M Goman2, A Quentin Summerfield2,3

  • 1Department of Psychology, University of York, York, YO10 5DD, UK. brileypm@gmail.com.

Journal of the Association for Research in Otolaryngology : JARO
|May 12, 2016
PubMed
Summary

Evidence suggests humans have a three-channel auditory system for sound localization, not just two. This midline channel is crucial for accurately perceiving sounds directly in front.

Keywords:
EEGauditory systemelectroencephalographyopponent processsound localizationspatial tuning

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Area of Science:

  • Auditory Neuroscience
  • Human Perception
  • Psychoacoustics

Background:

  • The auditory system is thought to represent horizontal space using two channels, one tuned to the left and one to the right.
  • Recent studies suggest an additional midline-tuned channel may exist in humans.

Purpose of the Study:

  • To investigate the physiological evidence for a midline-tuned auditory channel in humans using electroencephalography (EEG).
  • To compare the predictive power of two-channel versus three-channel auditory models.

Main Methods:

  • EEG was used to measure neural responses to auditory probe stimuli presented from various horizontal locations (0°, +30°, +90°).
  • Adapter stimuli were presented from 0° or alternating left/right locations to temporarily suppress specific auditory channels.
  • Adaptation effects were analyzed for probes presented from straight ahead (0°) and to the right (+90°).

Main Results:

  • Neural responses to a 0° probe were significantly more adapted by 0° adapters than by ±90° adapters, supporting a midline channel.
  • A computational model based on the three-channel account explained 93% of the variance in probe responses.
  • A two-channel model explained only 61% of the variance, indicating a poorer fit.

Conclusions:

  • The findings provide physiological evidence for a three-channel model of human auditory spatial representation, including a midline-tuned channel.
  • The three-channel model offers a more accurate explanation of neural responses and sound localization than the traditional two-channel model.