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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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Neuroplasticity01:01

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Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.
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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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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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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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Anatomy of the Ear01:16

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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

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A Method to Study Adaptation to Left-Right Reversed Audition
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Listening loops and the adapting auditory brain.

David McAlpine1, Livia de Hoz2,3

  • 1Department of Linguistics, Macquarie University, Sydney, NSW, Australia.

Frontiers in Neuroscience
|April 3, 2023
PubMed
Summary

The brain learns auditory statistics using "listening loops" connecting the ear to the cortex. Exploring these loops at various scales reveals how we distinguish background from foreground sounds.

Keywords:
adaptationauditoryfeedbacklistenloopsprediction

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Acoustic Scene Analysis

Background:

  • Auditory scene analysis relies on learning long-term sound statistical structures.
  • The brain analyzes acoustic environments over multiple timescales to separate relevant sounds from background noise.
  • Feedforward and feedback pathways, termed 'listening loops,' are crucial for auditory statistical learning.

Purpose of the Study:

  • To investigate the role of listening loops in processing auditory information across different timescales.
  • To understand how these loops contribute to the adaptive processes underlying auditory perception.
  • To explore the relationship between timescale detection, background sound identification, and the transformation of hearing into listening.

Main Methods:

  • Analysis of auditory processing across multiple scales, from in vivo recordings to human assessments.
  • Examination of the interplay between feedforward and feedback pathways in the auditory system.
  • Investigating the detection of regularities in acoustic environments over various temporal durations.

Main Results:

  • Listening loops are critical for adapting neural responses to sound environments unfolding over seconds, days, and longer.
  • These loops facilitate the separation of foreground sounds from background noise.
  • The scale of investigation impacts the understanding of auditory statistical learning.

Conclusions:

  • Listening loops are fundamental to auditory statistical learning and perceptual organization.
  • Understanding listening loops across different timescales is key to deciphering the mechanisms of auditory scene analysis.
  • This research highlights the dynamic and adaptive nature of the auditory system in transforming raw sound into meaningful listening experiences.