Reduction of social anxiety symptoms with transcranial direct current stimulation: A case report

Efficacy of CBT, intensified tDCS and their combination for reducing clinical symptoms and improving quality of life in social anxiety disorder with comorbid depression: a randomized controlled trial

BACKGROUND/AIM

Social anxiety disorder (SAD) is a common and disabling psychiatric disorder. It is generally treated with medication and psychotherapy such as cognitive-behavioral therapy (CBT). Due to the involvement of cortical and subcortical areas in the pathophysiology of SAD, non-invasive brain stimulation techniques such as transcranial Direct Current Stimulation (tDCS) are potential adjunctive treatment options for SAD. This study aims to assess comparable efficacy of CBT, intensified tDCS, and combined CBT/tDCS on clinical symptoms and quality of life of patients with SAD and comorbid depression.

METHODS

In this randomized controlled trial, 37 adults with SAD and comorbid depressive disorder were assigned into three groups: (1) CBT + active tDCS (n = 13), (2) active tDCS alone (n = 12), and (3) CBT + sham tDCS (n = 12). SAD symptoms, depressive states, quality of life and trait worry were assessed with the Liebowitz Social Anxiety Scale, Beck's Depression Inventory, QOL questionnaire (WHOQOL-BREF), and the Penn State Worry Questionnaire respectively. The active tDCS was an intensified stimulation protocol (20 min, twice-daily sessions with 20 min intervals, 5 consecutive days) and was applied over the left dorsolateral prefrontal cortex (F3) and medial prefrontal cortex (Fpz). The CBT was provided individually based on the exposure technique at 12-20 sessions, twice a week. All clinical measures were assessed at baseline, after the intervention, and at 3-month follow-up.

RESULTS

SAD symptoms significantly decreased after intervention and follow-up in all groups, with no significant differences between them. However, CBT + tDCS resulted in a numerically larger symptom reduction, significantly exceeding CBT + sham tDCS on the fear scale. Depressive states and trait worry significantly improved in all groups post-intervention and at the 3-month follow-up, with no between-group differences. Quality of life (total scores, physical, and psychological domains) significantly improved after the and at the 3-month follow-up only in the CBT + tDCS and tDCS-alone groups with no between-group differences.

CONCLUSION

Psychotherapeutic interventions​ with CBT, intensified tDCS targeting the prefrontal cortex, and the combined CBT-tDCS are effective for alleviating primary and secondary clinical symptoms in individuals with SAD. The combined CBT-tDCS intervention showed superior efficacy in reducing the primary symptoms of SAD.

TRIAL REGISTRATION ID

IRCT20220421054607N1, registration date: 19/05/2022, available at: https://irct.behdasht.gov.ir/trial/63119 .

Research hotspots and trends of neuroimaging in social anxiety: a CiteSpace bibliometric analysis based on Web of Science and Scopus database

Background

This study focused on the research hotspots and development trends of the neuroimaging of social anxiety (SA) in the past 25 years.

Methods

We selected 1,305 studies on SA neuroimaging from the Web of Science and Scopus from January 1998 to December 2023. CiteSpace was used to analyze the number of published articles visually, cited references, cooperation among authors and institutions, co-occurrence of keywords, clustering of keywords, burst of keywords, and time zone of co-occurring keywords.

Results

A total of 1,305 articles were included, and the annual number of articles published over nearly 25 years showed the overall trend is on the rise. The analysis of author and institutional collaboration reveals that most authors collaborate closely. Among them, the team led by Pine, Daniel S published 59 articles, making it the most central team. Harvard University is identified as the most central institution in this network. The research hotspots can be categorized into four areas: research techniques, cognitive processing research areas, core brain regions and brain networks, and the neural predictors of treatment outcomes in SA. The most recent burst keywords are "cognitive behavioral therapy," "systematic review," "machine learning," "major clinical study," "transcranial direct current stimulation," "depression," and "outcome assessment," which provided clues on research frontiers. Based on the burst map and keyword time zone map, it appears that exploring the activity of brain regions involved in cognitive processing, such as face processing and attentional bias, as well as the comorbidity of SA and depression, through brain imaging technology, using brain signals as predictors of treatment outcomes in SA.

Conclusion

This study conducted a comprehensive, objective, and visual analysis of publications, and revealed hot topics and trends concerning the study of the brain mechanism of SA from 1998 to 2023. This work might assist researchers in identifying new insights on potential collaborators and institutions, hot topics, and research directions.

Effects of transcranial direct current stimulation in children and young people with psychiatric disorders: a systematic review

Transcranial direct current stimulation (tDCS) has demonstrated benefits in adults with various psychiatric disorders, but its clinical utility in children and young people (CYP) remains unclear. This PRISMA systematic review used published and ongoing studies to examine the effects of tDCS on disorder-specific symptoms, mood and neurocognition in CYP with psychiatric disorders. We searched Medline via PubMed, Embase, PsychINFO via OVID, and Clinicaltrials.gov up to December 2022. Eligible studies involved multiple session (i.e., treatment) tDCS in CYP (≤ 25 years old) with psychiatric disorders. Two independent raters assessed the eligibility of studies and extracted data using a custom-built form. Of 33 eligible studies (participant N = 517), the majority (n = 27) reported an improvement in at least one outcome measure of disorder-specific symptoms. Few studies (n = 13) examined tDCS effects on mood and/or neurocognition, but findings were mainly positive. Overall, tDCS was well tolerated with minimal side effects. Of 11 eligible ongoing studies, many are sham-controlled RCTs (n = 9) with better blinding techniques and a larger estimated participant enrolment (M = 79.7; range 15-172) than published studies. Although encouraging, the evidence to date is insufficient to firmly conclude that tDCS can improve clinical symptoms, mood, or cognition in CYP with psychiatric disorders. Ongoing studies appear of improved methodological quality; however, future studies should broaden outcome measures to more comprehensively assess the effects of tDCS and develop dosage guidance (i.e., treatment regimens).