Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 113, Issue 24, Pages 6761-6766Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1522577113
Keywords
cortical layers; oscillations; high-resolution fMRI; EEG
Categories
Funding
- Netherlands Organization for Scientific Research by the VICI scheme [453-09-002]
- Netherlands Organization for Scientific Research [451-12-021]
- Wellcome Trust [WT100092MA]
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Electrophysiological recordings in animals have indicated that visual cortex gamma-band oscillatory activity is predominantly observed in superficial cortical layers, whereas alpha- and beta-band activity is stronger in deep layers. These rhythms, as well as the different cortical layers, have also been closely related to feedforward and feedback streams of information. Recently, it has become possible to measure laminar activity in humans with high-resolution functional MRI (fMRI). In this study, we investigated whether these different frequency bands show a differential relation with the laminar-resolved blood-oxygen level-dependent (BOLD) signal by combining data from simultaneously recorded EEG and fMRI from the early visual cortex. Our visual attention paradigm allowed us to investigate how variations in strength over trials and variations in the attention effect over subjects relate to each other in both modalities. We demonstrate that gamma-band EEG power correlates positively with the superficial layers' BOLD signal and that beta-power is negatively correlated to deep layer BOLD and alpha-power to both deep and superficial layer BOLD. These results provide a neurophysiological basis for human laminar fMRI and link human EEG and high-resolution fMRI to systems-level neuroscience in animals.
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