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Related Concept Videos

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...
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...
Interference: Path Lengths01:10

Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
The Cochlea01:13

The Cochlea

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.
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.

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Related Experiment Video

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Quantitative Assessment of Cortical Auditory-tactile Processing in Children with Disabilities
09:38

Quantitative Assessment of Cortical Auditory-tactile Processing in Children with Disabilities

Published on: January 29, 2014

Cortico-cortical phase synchrony in auditory mismatch processing.

Fu-Jung Hsiao1, Chia-Hsiung Cheng, Kwong-Kum Liao

  • 1Institute of Brain Science, National Yang-Ming University, Taipei, Taiwan.

Biological Psychology
|April 13, 2010
PubMed
Summary
This summary is machine-generated.

This study reveals that auditory change detection involves synchronized brain activity between temporal and frontal regions. Enhanced temporal-frontal connectivity in the left hemisphere and temporal-temporal/parietal connections in both hemispheres are key for processing unexpected sounds.

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Brain Connectivity

Background:

  • Previous research indicates temporal and frontal lobe involvement in change detection, evidenced by reduced Mismatch Negativity (MMN).
  • The precise interaction between the temporal lobe and other brain regions during the processing of unexpected auditory stimuli remains incompletely understood.

Purpose of the Study:

  • To investigate functional connectivity between cerebral regions during auditory change detection.
  • To measure phase synchrony of magnetoencephalographic (MEG) signals in response to standard tones and duration deviants.

Main Methods:

  • Magnetoencephalography (MEG) was used to record brain activity in 10 healthy adults.
  • An oddball paradigm presented standard tones and infrequent duration deviants.
  • Morlet wavelet-based analysis calculated phase synchrony (4-40 Hz) between 150-300 ms post-stimulus onset, referencing a temporal channel.

Main Results:

  • Significant phase synchronization was observed between temporal and ipsilateral frontal regions in auditory evoked responses.
  • Temporal-frontal synchronization was notably higher for deviant stimuli compared to standard stimuli (4-25 Hz, left hemisphere; 4-8 Hz, right hemisphere).
  • Deviant-evoked responses also showed temporal-temporal and temporal-parietal phase synchronies (4-8 Hz).

Conclusions:

  • The findings suggest a distributed neuronal network, including temporal-temporal, temporal-frontal, and temporal-parietal interactions, is crucial for auditory change detection.
  • Phase synchrony analysis offers a valuable method for studying cerebral reactivity to auditory deviants.