Noninvasive direct current stimulation for schizophrenia: a review.

Area of Science:

• Neuroscience
• Psychiatry
• Neuromodulation

Background:

• Schizophrenia presents significant challenges, including auditory verbal hallucinations (AVH), cognitive deficits, and negative symptoms.
• Treatment-resistant symptoms in schizophrenia necessitate novel therapeutic approaches.
• Transcranial direct current stimulation (tDCS) is a non-invasive neuromodulation technique with potential therapeutic applications.

Purpose of the Study:

• To review recent studies on the efficacy of tDCS in patients with schizophrenia.
• To focus on the effects of tDCS on auditory verbal hallucinations (AVH), cognitive deficits, and negative symptoms.
• To provide an update on the current understanding of tDCS for schizophrenia treatment.

Main Methods:

• Systematic review of recent research on tDCS for schizophrenia.
• Analysis of studies focusing on AVH, cognitive, and negative symptoms.
• Evaluation of reported adverse effects and stimulation parameters.

Main Results:

• tDCS has demonstrated limited efficacy for negative symptoms, except with high-frequency sessions.
• Results for AVH and cognitive symptoms remain inconclusive.
• tDCS is generally well-tolerated with few adverse effects.

Conclusions:

• Further research is essential to elucidate the mechanisms and optimal parameters for tDCS in schizophrenia.
• Increased duration and frequency of tDCS sessions may be beneficial.
• Investigating combined non-pharmacological treatments with tDCS is a crucial next step.