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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

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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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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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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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Amplifying Signals via Enzymatic Cascade01:22

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When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
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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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Related Experiment Video

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Optogenetic Stimulation of the Auditory Nerve
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A Cortico-Collicular Amplification Mechanism for Gap Detection.

Aldis P Weible1, Iryna Yavorska1, Michael Wehr1

  • 1Department of Psychology, Institute of Neuroscience, 1254 University of Oregon, Eugene, OR 97403, USA.

Cerebral Cortex (New York, N.Y. : 1991)
|February 15, 2020
PubMed
Summary
This summary is machine-generated.

The auditory cortex is crucial for detecting brief sound gaps, specifically their termination. A newly found circuit amplifies these brief gap signals for behavioral detection, aiding speech perception.

Keywords:
auditory cortexinferior colliculusneural computationspeech perceptiontemporal processing

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Sensory Processing

Background:

  • The auditory cortex (AC) is essential for detecting brief gaps in sounds.
  • The specific neural mechanisms and reasons for AC's role in brief gap detection remain unclear.
  • Understanding this is vital as brief gaps are important for speech and auditory scene analysis.

Purpose of the Study:

  • To elucidate the neural basis of auditory cortex's role in brief gap detection.
  • To identify the specific features of brief gaps that rely on cortical processing.
  • To uncover the circuit mechanisms linking cortical activity to behavioral gap detection.

Main Methods:

  • Used optogenetic suppression and conventional lesions to inactivate the auditory cortex.
  • Recorded neural responses in the auditory cortex and inferior colliculus (IC).
  • Analyzed neural responses (on- and off-responses) to gaps of varying durations.

Main Results:

  • Cortical dependence of gap detection is specifically linked to gap termination.
  • A cortico-collicular circuit amplifies cortical responses to brief gap terminations.
  • Temporal overlap of cortical on- and off-responses enhances brief gap representation in AC, impacting IC responses.

Conclusions:

  • The auditory cortex's enhanced representation of brief gaps, driven by temporal response overlap, is critical for their detection.
  • A cortico-collicular pathway amplifies these enhanced cortical signals to the inferior colliculus, influencing behavior.
  • These findings explain the specific role of AC in detecting brief gaps, essential for complex auditory processing like speech perception.