EEG mean frequency changes in healthy subjects during prefrontal transcranial direct current stimulation

Neri Accornero, Marco Capozza, Laura Pieroni, Stefano Pro, Leonardo Davì, Oriano Mecarelli

Research output: Contribution to journalArticlepeer-review

Abstract

In this pilot study we evaluated electroencephalographic (EEG) mean frequency changes induced by prefrontal transcranial direct current stimulation (tDCS) and investigated whether they depended on tDCS electrode montage. Eight healthy volunteers underwent tDCS for 15 min during EEG recording. They completed six tDCS sessions, 1 wk apart, testing left and right direct current (DC) dipole directions with six different montages: four unipolar montages (one electrode on a prefrontal area, the other on the opposite wrist) and two bipolar montages (both electrodes on prefrontal areas), and a single sham session. EEG power spectra were assessed from four 1-min EEG epochs, before, during, and after tDCS. During tDCS the outcome variable, brain rate (fb), changed significantly, and the changes persisted for minutes after tDCS ended. With the DC dipole directed to the left (anode on the left prefrontal area or wrist), fb increased, and with the DC dipole directed to the right (anode on the right prefrontal area or wrist), fb decreased, suggesting asymmetric prefrontal cortex functional organization in the normal human brain. Anodal and cathodal effects were opposite but equally large. Gender left these effects unchanged.

Original languageEnglish
Pages (from-to)1367-1375
Number of pages9
JournalJournal of Neurophysiology
Volume112
Issue number6
DOIs
Publication statusPublished - Sep 15 2014

Keywords

  • Brain rate
  • Brain stimulation
  • EEG
  • Prefrontal areas
  • TDCS

ASJC Scopus subject areas

  • Physiology
  • Neuroscience(all)
  • Medicine(all)

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