Mouse optical imaging for understanding resting-state functional connectivity in human fMRI.

Area of Science:

• Neuroscience
• Neuroimaging

Background:

• Resting-state functional connectivity (FC) in functional magnetic resonance imaging (fMRI) assesses brain connectomes.
• FC assumes a link between neuronal activity and hemodynamic signals, but direct evidence is limited.

Purpose of the Study:

• To investigate the neuronal basis of resting-state functional connectivity.
• To explore the relationship between neuronal activity and hemodynamic signals in the brain.

Main Methods:

• Utilized transgenic mice expressing a genetically encoded calcium indicator (GCaMP) for optical neuronal recording.
• Developed a method for simultaneous optical recording of neuronal activity and hemodynamic monitoring.
• Applied these methods to study large-scale brain activity in mice.

Main Results:

• Enabled direct observation of the relationship between neuronal activity and hemodynamic signals.
• Provided insights into the neuronal underpinnings of resting-state functional connectivity.
• Demonstrated the utility of GCaMP mice for studying brain networks.

Conclusions:

• GCaMP expressing transgenic mice serve as a valuable model system for addressing key questions in human resting-state fMRI.
• This research bridges the gap between neuronal activity and fMRI-based functional connectivity.
• Facilitates a deeper understanding of brain connectomes in health and disease.