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Effects of transcranial direct current stimulation on cognition and symptoms in Chinese patients with schizophrenia✰.

Abstract
There is preliminary evidence that transcranial direct current stimulation(tDCS) may improve symptoms and cognitive function in schizophrenia, but the generalizability of these results needs further investigation. We present a study of the effects of active vs. sham tDCS on cognition and symptoms in a sample of 45 Chinese patients with schizophrenia who showed significant cognitive deficits and were treated for 10 sessions with active or sham tDCS. Psychiatric symptoms were assessed by PANSS scores, and cognitive symptoms assessed by MATRICS battery and other tests. There were no differences between cognitive or symptom scores between subjects treated with active vs. sham tDCS tested within 1-2 days after the end of the 10th session. However, two weeks later subjects treated with active tDCS showed significantly more improvements on MATRICS Speed of Processing domain. MATRICS Overall Composite and a CogState measure related to accuracy on a 1-back working memory task were improved at two weeks in statistical tests without multiple corrections. The improvement in cognitive test scores 2 weeks after the last tDCS session, suggests longer term effects may be related to changes in neuroplasticity induced by 10 sessions of tDCS. The lack of significant changes in cognition shortly after the completion of 10 tDCS sessions contrasts with our earlier positive findings in U.S. patients with schizophrenia.
AuthorsRobert C Smith, Wei Li Md, Yiran Wang, Jiangling Jiang, JiJun Wang, Victoria Szabo, Robert Faull, Hua Jin, John M Davis, Chunbo Li
JournalPsychiatry research (Psychiatry Res) Vol. 284 Pg. 112617 (02 2020) ISSN: 1872-7123 [Electronic] Ireland
PMID31806403 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
CopyrightCopyright © 2019 Elsevier B.V. All rights reserved.
Topics
  • Adult
  • Asian People (psychology)
  • Cognition (physiology)
  • Cognitive Dysfunction (diagnosis, physiopathology, therapy)
  • Female
  • Follow-Up Studies
  • Humans
  • Male
  • Memory, Short-Term (physiology)
  • Middle Aged
  • Schizophrenia (diagnosis, physiopathology, therapy)
  • Schizophrenic Psychology
  • Transcranial Direct Current Stimulation (methods)
  • Treatment Outcome
  • Young Adult

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