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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 cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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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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Temporal prediction errors in visual and auditory cortices.

Hweeling Lee1, Uta Noppeney2

  • 1Cognitive Neuroimaging Group, Max Planck Institute for Biological Cybernetics, Tübingen, Germany; German Center for Neurodegenerative Diseases (DZNE), Bonn, Germany.

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|April 17, 2014
PubMed
Summary
This summary is machine-generated.

The brain uses predictive coding to integrate multisensory information. Asynchronous audiovisual signals generate prediction errors in specific brain regions, revealing how we perceive a coherent environment.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Sensory Integration

Background:

  • The brain integrates multisensory inputs to form a coherent perception.
  • Temporal synchrony is crucial for multisensory integration, but neural mechanisms are unclear.
  • Predictive coding theory proposes the brain minimizes prediction errors between sensory input and internal models.

Discussion:

  • This study investigated audiovisual integration using functional magnetic resonance imaging (fMRI).
  • Participants viewed movies with synchronous, visual-leading, or auditory-leading speech, sinewave speech, or music.
  • Brain responses were analyzed to identify neural correlates of temporal binding and prediction error.

Key Insights:

  • Auditory-leading asynchrony generated prediction errors in visual cortices.
  • Visual-leading asynchrony elicited prediction errors in auditory cortices.
  • These findings support predictive coding as a mechanism for temporal binding across senses.

Outlook:

  • This research provides a foundation for understanding audiovisual processing and perceptual coherence.
  • Future studies could explore individual differences in prediction error signaling.
  • Investigating other sensory modalities within the predictive coding framework is warranted.