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Linking visual gamma to task-related brain networks-a simultaneous EEG-fMRI study
Ewa Beldzik1, Aleksandra Domagalik2, Anna Beres1
1Institute of Applied Psychology, Faculty of Management and Social Communication, Jagiellonian University, Krakow, Poland.
Psychophysiology
|August 18, 2019
Summary
Human gamma-band oscillations, crucial for cognition, were linked to brain networks using EEG-fMRI. The occipito-parietal network showed covariations with gamma activity during color discrimination, revealing electrophysiological underpinnings of brain connectivity.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Electrophysiology
Background:
- Human gamma-band oscillations are linked to neuronal populations and cognitive processes.
- Gamma activity positively correlates with fMRI BOLD signal, but its functional connectivity is understudied.
- Visual gamma has been detected using concurrent EEG-fMRI and linked to visual cortex activity.
Purpose of the Study:
- To investigate which fMRI brain network is related to gamma activity during a color discrimination task.
- To explore the electrophysiological basis of functional connectivity revealed by BOLD signals.
- To understand the neural mechanisms underlying color discrimination.
Main Methods:
- Concurrent electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) were used.
- Advanced denoising and multitaper spectral decomposition detected gamma oscillations in EEG.
- Group independent component analysis (ICA) identified task-related fMRI networks.
Main Results:
- Despite excluding trials with motor responses, EEG gamma oscillations and fMRI data were successfully coupled.
- An occipito-parietal network exhibited significant trial-by-trial covariations with gamma oscillations.
- This network included the extrastriate visual cortex, precuneus, intraparietal, and anterior insular cortices.
Conclusions:
- The visual cortex is identified as the source of gamma oscillations.
- Other brain regions within the occipito-parietal network show feedforward and feedback connections related to gamma activity.
- Findings provide evidence for the electrophysiological basis of BOLD-based connectivity and offer insights into color discrimination mechanisms.
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