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Auditory Pathway

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...

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Disruption of Frontal Lobe Neural Synchrony During Cognitive Control by Alcohol Intoxication

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Published on: February 6, 2019

Gamma-band synchronisation in a frontotemporal auditory information processing network.

Gregor Leicht¹, Jonas Björklund¹, Sebastian Vauth¹

¹Department of Psychiatry and Psychotherapy, Psychiatry Neuroimaging Branch (PNB), University Medical Center Hamburg-Eppendorf, Martinistr. 52, Hamburg D-20246, Germany.

|June 26, 2021

Summary

This summary is machine-generated.

Neural oscillations, specifically gamma synchronisation, facilitate top-down auditory information processing. This study reveals frontotemporal network connectivity between the auditory cortex and anterior cingulate cortex using EEG and fMRI.

Keywords:

Anterior cingulate cortex Auditory cortex Generalized psychophysiological interaction Granger causality analysis Lagged phase synchronisation Simultaneous EEG and fMRI

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Area of Science:

Neuroscience
Cognitive Science
Brain Imaging

Background:

Neural oscillations are crucial for brain coordination during cognitive tasks.
A frontotemporal network involving the auditory cortex (AC) and anterior cingulate cortex (ACC) is implicated in auditory processing.

Purpose of the Study:

To investigate functional and effective connectivity within the frontotemporal network.
To explore the role of gamma oscillations in auditory information processing.

Main Methods:

Simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) were recorded in 28 healthy subjects.
Connectivity between ACC and AC was analyzed using EEG and fMRI measures, including Granger causality analysis.

Main Results:

Significant BOLD signal correlation and task-dependent fMRI connectivity increase between ACC and AC were observed.
Increased gamma-frequency functional coupling (LPS) showed a top-down influence from ACC to AC.
EEG and fMRI connectivity measures were positively correlated, indicating mirrored patterns.

Conclusions:

The anterior cingulate cortex exerts top-down influence on the auditory cortex via gamma synchronisation.
fMRI connectivity patterns reflect brain connectivity based on gamma oscillation synchronisation.