Neural correlates of acute post-traumatic dissociation: a functional neuroimaging script-driven imagery study

Area of Science:

• Neuroscience
• Psychiatry
• Neuroimaging

Background:

• Current models link post-traumatic stress disorder (PTSD) dissociation to altered brain activation.
• Script-driven imagery is used to study dissociation, but neuroimaging findings are inconsistent and based on small samples.

Purpose of the Study:

• To identify neural correlates of acute dissociation using script-driven imagery and functional magnetic resonance imaging (fMRI).

Main Methods:

• fMRI data collected from 51 female PTSD patients with childhood trauma history.
• Analyzed blood-oxygen-level-dependent response during traumatic vs. neutral autobiographical memory recall.
• Correlated brain activation clusters with dissociation measures.

Main Results:

• Enhanced activation observed in cerebellum, occipital gyri, supramarginal gyrus, and amygdala during trauma recall.
• No significant correlation found between activation clusters and dissociative symptoms.
• Patients reported increased acute dissociation post-paradigm.

Conclusions:

• This large fMRI study investigated dissociative neural biomarkers in PTSD patients.
• Null findings underscore the difficulty in extracting reliable neurobiological biomarkers for subjective experiences like dissociation.
• Highlights challenges in neuroimaging reproducibility and biomarker discovery.