Journal
BRAIN STIMULATION
Volume 2, Issue 4, Pages 201-207Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.brs.2009.03.005
Keywords
tDCS; focality; finite element modeling; MRI human head model; transcranial electrical stimulation
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Funding
- National Institutes of Health (NIH) [S06 GM008168 NS054783]
- Andy Grove Foundation
- PSC-CUNY grants
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The spatial resolution of conventional transcranial direct current stimulation (tDCS) is considered to be relatively diffuse owing to skull dispersion. However, we show that electric fields maybe clustered at distinct gyri/sulci sites because of details in tissue architecture/conductivity, notably cerebrospinal fluid (CSF). We calculated the cortical electric field/current density magnitude induced during tDCS using a high spatial resolution (1 mm(3)) magnetic resonance imaging (MRI)-derived finite element human head model; cortical gyri/sulci were resolved. The spatial focality of conventional rectangular-pad (7 x 5 cm(2)) and the ring (4 x 1) electrode configurations were compared. The rectangular-pad configuration resulted in diffuse (unfocal) modulation, with discrete clusters of electric field magnitude maxima. Peak-induced electric field magnitude was not observed directly underneath the pads, but at an intermediate lobe. The 4 x 1 ring resulted in enhanced spatial focality, with peak-induced electric field magnitude at the sulcus and adjacent gyri directly underneath the active electrode. Cortical structures may be focally targeted by using ring configurations. Anatomically accurate high-resolution MRI-based forward-models may guide the rational clinical design and optimization of tDCS. (C) 2009 Elsevier Inc. All rights reserved.
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