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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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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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Perception of Sound Waves01:01

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The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
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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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Auditory Perception01:17

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The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the...
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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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Related Experiment Video

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Quantitative Assessment of Cortical Auditory-tactile Processing in Children with Disabilities
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Perceptual gap detection is mediated by gap termination responses in auditory cortex.

Aldis P Weible1, Alexandra K Moore1, Christine Liu1

  • 1Institute of Neuroscience, University of Oregon, Eugene, OR 97405, USA.

Current Biology : CB
|July 2, 2014
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Summary

This study reveals that auditory cortex activity after a sound gap is crucial for detecting that gap. Manipulating neural activity before or after the gap altered gap detection performance in mice.

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Area of Science:

  • Auditory Neuroscience
  • Computational Neuroscience
  • Sensory Processing

Background:

  • Age-related hearing impairments often involve difficulties understanding speech in noisy environments.
  • Temporal acuity deficits contribute to these age-related speech processing challenges.
  • Gap detection, a measure of temporal acuity, uses brief sound interruptions to modulate responses.

Purpose of the Study:

  • To investigate the causal role of auditory cortical neural activity, specifically the gap termination response (GTR), in perceptual gap detection.
  • To determine how modulating inhibitory and excitatory neural activity in the auditory cortex affects gap detection behavior.

Main Methods:

  • Optogenetic suppression of specific neuronal populations (inhibitory interneurons and excitatory neurons) in the auditory cortex of behaving mice.
  • Targeted suppression during distinct epochs (pre-gap and post-gap intervals) of a gap detection task.

Main Results:

  • Enhancing gap detection by suppressing inhibitory interneuron activity during the post-gap interval.
  • Attenuating gap detection by suppressing excitatory neuron activity during the post-gap interval.
  • Opposite effects when activity was suppressed during the pre-gap interval, with no effect when suppression spanned both intervals.

Conclusions:

  • Established a causal link between post-gap auditory cortical activity and perceptual gap detection.
  • Proposed that gap detection relies on comparing neural activity before and after the gap.
  • Developed a neural circuit model that explains the observed neural and behavioral outcomes.