Tracking resting state connectivity dynamics in veterans with PTSD.

Area of Science:

• Neuroscience
• Psychiatry
• Medical Imaging

Background:

• Posttraumatic stress disorder (PTSD) is linked to functional brain abnormalities, particularly in threat detection and emotion regulation networks.
• Previous neuroimaging studies report altered salience and executive function networks in PTSD.

Purpose of the Study:

• To investigate the dynamic properties of resting-state functional magnetic resonance imaging (fMRI) networks in combat-related PTSD.
• To utilize a novel multimodal approach integrating electroencephalography (EEG) and fMRI to analyze brain activity.

Main Methods:

• Simultaneous EEG and fMRI were used to record neurobiological activity in 36 veterans with combat-related PTSD and 20 controls.
• A new strategy integrated EEG microstates with fMRI to quantify fast temporal dynamics of resting-state networks.

Main Results:

• Distinct microstate occurrence rates were observed in the dorsal default mode network and salience networks in the PTSD group.
• Dorsal default mode network microstate rates correlated positively with PTSD severity; anterior salience network microstate rates correlated negatively with hedonic tone.

Conclusions:

• Findings highlight abnormal network dynamics in combat-related PTSD, offering insights into the disorder's pathophysiology.
• Simultaneous EEG-fMRI is a promising tool for studying PTSD neurobiology.