Greater Dynamic and Lower Static Functional Brain Connectivity Prospectively Predict Placebo Response in Pediatric...

Area of Science:

• Neuroscience
• Psychiatry
• Medical Imaging

Background:

• Placebo response significantly hinders treatment effect detection in pediatric anxiety and affective disorder clinical trials.
• Identifying neurofunctional predictors of placebo response is crucial for advancing clinical psychopharmacology.

Purpose of the Study:

• To identify neurofunctional predictors of placebo response in adolescents with generalized anxiety disorder (GAD).
• To examine dynamic and static functional brain connectivity as potential predictors of placebo response.

Main Methods:

• Resting-state functional magnetic resonance imaging (fMRI) was performed on 25 adolescents (aged 12-17) with GAD before placebo randomization.
• Whole-brain voxelwise correlation analyses assessed relationships between symptom change and seed-based functional connectivity in salience and ventral attention networks.

Main Results:

• Greater dynamic functional connectivity variability in the amygdala, dorsal anterior cingulate cortex (dACC), and ventrolateral prefrontal cortex (VLPFC) correlated with increased placebo response.
• Specific patterns of static functional connectivity (e.g., lower amygdala-dlPFC connectivity, higher VLPFC-IPL connectivity) were associated with greater placebo response.

Conclusions:

• Placebo response in GAD is linked to a unique connectivity profile: variable dynamic and weak static connectivity within specific brain networks.
• These findings offer mechanistic insights into how circuit-based biotypes relate to placebo response, aiding in the development of predictive biosignatures.