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Modulation of cortical responses by transcranial direct current stimulation of dorsolateral prefrontal cortex: A resting-state EEG and TMS-EEG study

经颅直流电刺激 脑电图 背外侧前额叶皮质 神经调节 磁刺激 刺激 心理学 神经科学 医学 前额叶皮质 听力学 认知
作者
Pedro Caldana Gordon,Christoph Zrenner,Debora Desideri,Paolo Belardinelli,Brigitte Zrenner,André R. Brunoni,Ulf Ziemann
出处
期刊:Brain Stimulation [Elsevier]
卷期号:11 (5): 1024-1032 被引量:52
标识
DOI:10.1016/j.brs.2018.06.004
摘要

Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique with potential for cost-effective therapeutic neuromodulation. Although positive therapeutic effects were found by stimulating the dorsolateral prefrontal cortex (DLPFC), few studies have investigated physiological effects of DLPFC-tDCS.To investigate effects of tDCS with different parameter settings applied to the left DLPFC on cortical responses, measured by resting-state electroencephalography (rs-EEG) and transcranial magnetic stimulation (TMS)-evoked/induced EEG responses.22 healthy subjects underwent 5 tDCS sessions with different tDCS parameter settings in a double-blinded randomized crossover design (1: 1.5 mA, anode left-DLPFC, cathode right-DLPFC; 2: 1.5 mA, cathode left-DLPFC, anode right-DLPFC; 3: 0.5 mA, anode left-DLPFC, cathode right-DLPFC; 4: 1.5 mA, anode left-DLPFC, cathode left deltoid muscle; 5: sham stimulation). Rs-EEG and TMS-EEG were recorded before and after tDCS.Rs-EEG power spectrum analysis showed no difference comparing baseline with post stimulation in any of the tDCS conditions. TMS-EEG evoked potential amplitude decreased in parietal cortex after 1.5 mA left-DLPFC anodal tDCS, and TMS-induced gamma and theta oscillations decreased after all conditions using left-DLPFC anodal tDCS. Left-DLPFC cathodal tDCS did not lead to significant change. None of the post-intervention changes was different when comparing the effects across conditions, including sham.Our study does not provide evidence that a single tDCS session results in significant changes in rs-EEG, using the current stimulation parameters. Significant changes in EEG responses to TMS pulses were observed following the anodal 1.5 mA tDCS interventions, although these changes were not statistically significant in a group comparison.
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