Prefronto–cerebellar transcranial direct current stimulation improves visuospatial memory, executive functions, and neurological soft signs in patients with euthymic bipolar disorder
Authors Minichino A, Bersani FS, Bernabei L, Spagnoli F, Vergnani L, Corrado A, Taddei I, Biondi M, Delle Chiaie R
Received 11 December 2014
Accepted for publication 31 January 2015
Published 28 August 2015 Volume 2015:11 Pages 2265—2270
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 3
Editor who approved publication: Dr Roger Pinder
Amedeo Minichino, Francesco Saverio Bersani, Laura Bernabei, Francesco Spagnoli, Lucilla Vergnani, Alessandra Corrado, Ines Taddei, Massimo Biondi, Roberto Delle Chiaie
Department of Neurology and Psychiatry, Sapienza University of Rome, Rome, Italy
Objective: The aim of the study was to improve neuropsychological functioning of euthymic patients with bipolar disorder (BD) using transcranial direct current stimulation (tDCS) applied to cerebellar and prefrontal cortices.
Methods: Twenty-five BD outpatients underwent prefrontal (anodal) and cerebellar (cathodal) tDCS for 3 consecutive weeks. All participants were assessed through the Rey Complex Figure Test delay and copy and the Neurological Examination Scale at baseline and after therapy with tDCS.
Results: After tDCS treatment, patients showed significant improvements in visuospatial memory tasks. Patients with worse baseline cognitive performances also showed a significant improvement in executive functioning tasks. Neurological Examination Scale total score and motor coordination subscale significantly improved.
Conclusion: Prefrontal-excitatory and cerebellar-inhibitory stimulations in euthymic BD patients may lead to better neurocognitive performances. This improvement could result from the modulation of prefronto–thalamic–cerebellar circuit activity pattern, which can be disrupted in BD.
Keywords: cerebellum, dorsolateral prefrontal cortex, neuropsychology, cognition
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