Does transcranial direct current stimulation to the prefrontal cortex affect social behavior? A meta-analysis.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Behavioral Science

Background:

• Transcranial direct current brain stimulation (tDCS) is a non-invasive neuromodulation technique.
• Its application to the prefrontal cortex has been explored for various cognitive and behavioral outcomes.
• Understanding the efficacy of tDCS on social behaviors is crucial for therapeutic and research applications.

Purpose of the Study:

• To systematically evaluate the effect of prefrontal cortex tDCS on a range of social behaviors.
• To identify which specific social behaviors are most amenable to tDCS intervention.
• To investigate potential moderating factors and publication bias in the tDCS literature for social behaviors.

Main Methods:

• A meta-analysis of 48 studies with a total of 2196 participants was conducted.
• The primary outcome was the effect of tDCS on social behaviors including aggression, overeating, impulsivity, bias, honesty, and risk-taking.
• Statistical analyses included examination of moderators and publication bias.

Main Results:

• tDCS demonstrated a significant overall effect in reducing undesirable behaviors (d = -0.20).
• The strongest effects were observed for reducing risk-taking behavior, bias, and overeating.
• No significant effects were found for aggression, impulsivity, or dishonesty. Publication bias was detected, reducing the overall effect size after correction (d = -0.10).

Conclusions:

• Prefrontal cortex tDCS shows potential for mitigating certain undesirable social behaviors, particularly risk-taking, bias, and overeating.
• The findings highlight the need for robust study designs and sufficient statistical power to detect tDCS effects on social behavior.
• The presence of publication bias suggests that null findings may be underrepresented in the current literature.