Transcranial direct current stimulation over the right parietal cortex improves the depressive disorder: A...

Area of Science:

• Neuroscience
• Psychiatry
• Neuromodulation

Background:

• The right posterior parietal cortex is crucial for emotional processing and executive control.
• Dysfunction in this region is observed in major depressive disorder (MDD).
• Current treatments for MDD have limitations, necessitating novel therapeutic approaches.

Purpose of the Study:

• To investigate the efficacy of transcranial direct current stimulation (tDCS) targeting the right posterior parietal cortex in MDD patients.
• To assess the impact of tDCS on clinical symptoms of depression and anxiety.

Main Methods:

• A sample of 12 MDD patients received tDCS targeting the right parietal cortex (anode) and left mastoid (cathode).
• Stimulation parameters included 2.0 mA intensity for 20 minutes, twice daily for 14 consecutive days.
• Symptom severity was measured using the Hamilton Depression Rating Scale-17 (HDRS-17) and Hamilton Anxiety Rating Scale (HARS) pre- and post-treatment.

Main Results:

• Significant reductions in HDRS-17 scores were observed post-tDCS treatment (p < .001).
• Specific symptom clusters including anxiety/somatization, cognitive deficits, retardation, and sleep disturbances showed significant improvement (p < .05).
• A significant decrease in HARS scores indicated reduced anxiety levels (p < .01).

Conclusions:

• The right posterior parietal cortex is a viable target for tDCS in treating major depressive disorder.
• tDCS applied to this region shows potential for improving both depressive and anxiety symptoms.
• Further research is warranted to optimize tDCS protocols for MDD treatment efficacy.