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Related Concept Videos

Auditory Perception01:17

Auditory Perception

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 cochlea, a...
Hearing01:31

Hearing

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.
Parallel Processing01:20

Parallel Processing

The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
Perception of Sound Waves01:01

Perception of Sound Waves

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.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same frequency...
Auditory Pathway01:15

Auditory Pathway

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 the...
Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...

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Infant Auditory Processing and Event-related Brain Oscillations
06:34

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Published on: July 1, 2015

Neural processing of asynchronous audiovisual speech perception.

Ryan A Stevenson1, Nicholas A Altieri, Sunah Kim

  • 1Department of Psychological and Brain Sciences, Indiana University, Bloomington, IN, USA. stevenra@indiana.edu

Neuroimage
|December 17, 2009
PubMed
Summary
This summary is machine-generated.

Temporal synchrony influences multisensory perception. Two distinct subregions in the multisensory superior temporal cortex (mSTC) show different activation patterns, suggesting varied neural mechanisms for integrating audiovisual speech signals.

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Area of Science:

  • Neuroscience
  • Auditory-Visual Integration
  • Multisensory Processing

Background:

  • Temporal synchrony of auditory and visual stimuli impacts event perception.
  • Neural mechanisms underlying temporal synchrony's influence on perception remain unclear.

Purpose of the Study:

  • To investigate the neural mechanisms of temporal synchrony in multisensory superior temporal cortex (mSTC).
  • To identify distinct subregions within mSTC and their roles in audiovisual integration.

Main Methods:

  • Utilized BOLD fMRI with parametrically varied stimulus asynchrony.
  • Identified activation patterns in two distinct subregions of mSTC.
  • Conducted a whole-brain analysis to identify responsive regions to synchronous vs. asynchronous speech.

Main Results:

  • A synchrony-defined mSTC subregion responded only to synchronous stimuli.
  • A bimodal mSTC subregion showed increased activation with increasing asynchrony.
  • A network including right mSTC, superior colliculus, and visual cortex responded more to synchronous speech.

Conclusions:

  • Bilateral mSTC comprises distinct multisensory subregions integrating audiovisual speech via different mechanisms.
  • These subregions exhibit differential sensitivity to stimulus properties like temporal synchrony.
  • Individual differences may influence the observed right lateralization of mSTC.