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Related Concept Videos

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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.
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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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Language is a system of communication that allows the expression of thoughts, ideas, and feelings. The brain processes language in both hemispheres.
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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 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

Updated: Oct 18, 2025

Mapping the After-effects of Theta Burst Stimulation on the Human Auditory Cortex with Functional Imaging
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Visual speech differentially modulates beta, theta, and high gamma bands in auditory cortex.

G Karthik1, John Plass1, Adriene M Beltz1

  • 1Department of Psychology, University of Michigan, Ann Arbor, Michigan, USA.

The European Journal of Neuroscience
|September 29, 2021
PubMed
Summary

Visual speech significantly impacts auditory speech perception in the superior temporal gyrus (STG). Distinct neural responses across frequency bands suggest multiple, not unitary, crossmodal processes support audiovisual communication.

Keywords:
ECoGaudiovisualiEEGintracranialmultisensorysEEGspeech

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Visual Speech Processing

Background:

  • Accurate speech perception relies on both auditory and visual cues.
  • Visual speech influences activity in auditory cortical areas like the superior temporal gyrus (STG).
  • The nature of this visual modulation (unitary vs. distinct processes) remains unclear.

Purpose of the Study:

  • To investigate whether visual modulation of auditory speech processing involves single or multiple distinct neural mechanisms.
  • To characterize the temporal and spatial patterns of neural activity in response to audiovisual speech.

Main Methods:

  • Utilized intracranial electroencephalography (iEEG) from 21 epilepsy patients.
  • Recorded neural responses to audiovisual speech stimuli.
  • Analyzed activity across different frequency bands (theta, beta, high gamma) in the STG.

Main Results:

  • Visual speech induced temporally and spatially distinct modulations in the STG across frequency bands.
  • Theta band: visual speech suppressed auditory responses from -93 to 500 ms, strongest in posterior STG.
  • Beta band: suppression occurred in anterior STG (-311 to -195 ms) and middle STG (-195 to 235 ms).
  • High gamma band: visual speech enhanced auditory responses from -45 to 24 ms in posterior STG.

Conclusions:

  • Findings suggest multiple, distinct neural processes underlie audiovisual speech perception.
  • Pre-speech onset modulations may reflect crossmodal prediction.
  • Post-speech onset modulations might indicate decreased sustained feedforward auditory activity.