Functional connectivity and brain activation: a synergistic approach.

Area of Science:

• Neuroimaging
• Cognitive Neuroscience
• Network Neuroscience

Background:

• Traditional functional magnetic resonance imaging (fMRI) offers limited views of brain function, either through periodic cognitive challenges or resting-state connectivity.
• Combining these approaches can provide a more comprehensive understanding of brain activity.

Purpose of the Study:

• To investigate functional connectivity density (FCD) changes during a continuous visual attention task compared to resting-state.
• To explore how FCD mapping complements standard fMRI in understanding task-related brain function.

Main Methods:

• Forty-five healthy volunteers underwent resting-state and continuous visual attention task fMRI scans.
• Standard fMRI with a blocked visual attention task was also performed.
• High-resolution, data-driven FCD mapping was employed to analyze connectivity changes.

Main Results:

• Task performance correlated with decreased FCD in brain regions with weak activation/deactivation.
• A negative correlation was observed between blood oxygen level-dependent (BOLD)-fMRI activation and task-related FCD decreases.
• Improved task accuracy was associated with stronger FCD decreases, suggesting disconnection of task-irrelevant networks.

Conclusions:

• Functional connectivity density (FCD) mapping effectively identifies task-related connectivity changes.
• FCD mapping provides complementary information to traditional fMRI, enhancing the understanding of brain function.
• Task performance involves the disconnection of task-irrelevant brain networks, as evidenced by FCD decreases.