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Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example
Published on: October 24, 2012
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Nested oscillations and brain connectivity during sequential stages of feature-based attention
Mattia F Pagnotta1, David Pascucci2, Gijs Plomp1
1Perceptual Networks Group, Department of Psychology, University of Fribourg, Fribourg, Switzerland.
Neuroimage
|September 11, 2020
Summary
This study reveals how brain rhythms and network efficiency coordinate visual selective attention. Beta rhythms enhance anticipatory routing, while alpha and gamma band activity manage stimulus-evoked processing.
Area of Science:
- Neuroscience
- Cognitive Science
- Computational Neuroscience
Background:
- Visual selective attention involves local and network brain activity at specific oscillatory rhythms.
- The interplay between these local and network-level changes is not fully understood.
Purpose of the Study:
- To investigate anticipatory and reactive effects of feature-based attention on brain activity and connectivity.
- To explore the interplay between local neuronal rhythms and network-level interactions during attention.
Main Methods:
- Simultaneous fMRI and EEG recordings were used to capture brain activity during visual selective attention tasks.
- EEG source analysis focused on local neuronal rhythms and nested oscillations.
- Graph analysis examined connectivity changes in fMRI-defined regions of interest.
Main Results:
- A cascade of attentional effects was observed across multiple spatial scales.
- Beta rhythms (β) were associated with anticipatory information routing via increased network efficiency.
- Reactive alpha-band (α) desynchronization and increased alpha-gamma (α-γ) coupling in sensory areas mediated stimulus processing.
Conclusions:
- The findings reconcile theories of selective attention by demonstrating how different brain rhythms and network dynamics contribute to anticipatory and reactive attentional processes.
- Beta rhythms facilitate proactive information flow, while alpha and gamma oscillations are crucial for processing attended stimuli.
