Neuroimaging and Functional Connectivity in Social Anxiety Disorders

Social anxiety disorder is characterised by an excessive fear of negative evaluation in social contexts and is mediated by complex neural circuits. Neuroimaging techniques, notably functional magnetic resonance imaging (fMRI), have revealed both structural and functional alterations in patients. At rest, aberrant synchronisation within large-scale networks—such as the default mode network, salience network and attention networks—manifests as both heightened and diminished connectivity between limbic regions and prefrontal control hubs. Task-based paradigms probing self-referential processing and emotional face recognition consistently demonstrate hyper-reactivity in the amygdala and fusiform gyrus, coupled with attenuated regulatory influences from the medial prefrontal cortex. Morphological studies using measures of cortical thickness and voxel-based morphometry have identified region-specific changes in superior frontal, fusiform and insular cortices that correlate with symptom severity. Recent methodological advances—including dynamic functional network connectivity analyses and effective connectivity modelling—have further elucidated time-varying network states and directed inter-regional influences. Together, these multimodal insights afford a detailed understanding of the neurobiological substrates underpinning social anxiety, offering pathways to early identification, tailored therapeutic strategies and objective markers of treatment efficacy.

Research from Nature Portfolio

Recent structural MRI analyses in individuals with subthreshold social anxiety have highlighted cortical thickness variations in regions implicated in self-evaluation and face processing. Whole-brain voxel-wise correlational methods revealed a positive association between social anxiety measures and superior frontal gyrus thickness, while performance anxiety levels were inversely related to fusiform gyrus thickness. These findings suggest that even mild social anxiety traits are underpinned by subtle morphological alterations in prefrontal and temporal cortices, pointing towards early neural markers for the disorder.

Neuroimaging and Functional Connectivity in Social Anxiety Disorders publication trend

The graph below shows the total number of articles in neuroimaging and functional connectivity in social anxiety disorders across all publications each year (not limited to Nature Index journals).

Technical terms

Functional magnetic resonance imaging: Non-invasive technique that measures blood oxygenation changes as a proxy for neuronal activity.

Functional connectivity: Statistical dependencies between spatially distinct brain regions over time.

Dynamic functional network connectivity: Temporal fluctuations in connectivity patterns among large-scale brain networks.

Default mode network: A set of brain regions active during rest and self-referential thought processes.

Cortical thickness: The distance between the white and grey matter surfaces, indicative of regional brain morphology.

Effective connectivity: Directed influence exerted by one neural region over another, often modelled within task contexts.

References

1. A brain model of altered self-appraisal in social anxiety disorder. Translational Psychiatry (2023).
2. Abnormal large‐scale brain functional network dynamics in social anxiety disorder. CNS Neuroscience & Therapeutics (2024).
3. Altered cortical thickness of the superior frontal gyrus and fusiform gyrus in individuals with subthreshold social anxiety. Scientific Reports (2023).