Relating neural oscillations to laminar fMRI connectivity in visual cortex.

Area of Science:

• Neuroimaging
• Cognitive Neuroscience
• Electrophysiology

Background:

• Laminar functional magnetic resonance imaging (fMRI) offers potential for studying brain connectivity at the cortical layer level in humans.
• Understanding the relationship between neural oscillations and laminar connectivity is crucial for deciphering brain function.

Purpose of the Study:

• To investigate the relationship between electroencephalography (EEG) power modulations and laminar functional magnetic resonance imaging (fMRI) connectivity within and between visual cortex regions.
• To explore how task-induced attentional changes affect these relationships.

Main Methods:

• Simultaneous recording of high-resolution fMRI and EEG data during a task with an attentional component.
• Analysis of EEG power modulations (alpha, beta, gamma bands) and their correlation with laminar fMRI connectivity changes within and between visual brain regions.

Main Results:

• A decrease in beta power correlated with increased deep-to-deep layer coupling between regions and increased deep/middle-to-superficial layer connectivity within regions.
• An attention-related decrease in alpha power was predominantly linked to reduced connectivity between deep and superficial layers within regions.
• No significant correlation was found between laminar connectivity and gamma band oscillations.

Conclusions:

• Beta and alpha band oscillations are significantly related to laminar-specific fMRI connectivity, suggesting distinct neural processes.
• Differential effects of alpha and beta bands on connectivity indicate their involvement in separate feedback-related neural mechanisms.
• Laminar connectivity is modulated by specific brain oscillation frequencies during attentional processing.