M. F. Villamar, P. Wivatvongvana, J.Patumanond, M. Bikson, D.Q. Truong, A. Datta, F. Fregni. Focal modulation of primary motor cortex in Fibromyalgia using 4×1-Ring High-Definition Transcranial Direct Current Stimulation (HD-tDCS): Immediate and delayed analgesic effects of cathodal and anodal stimulation. J Pain, 2013; 14(4): 371-83 – Can be downloaded here: Villamar_Bikson_Focal_Modulation_HDtDCS_Pain_2013
H.I. Kuo, A. Datta, M. Bikson, P. Minhas. W. Paulus, M.F. Kuo, M.A. Nitsche Comparing cortical plasticity induced by conventional and high-definition 4×1 ring tDCS: a neurophysiological study. Brain Stimulation. 2013 6(4):644-8 Can be downloaded here: Kuo_Bikson_HDtDCS_Cortical_Plasticity_BrainStimulation_2013
Watch the new HD-tDCS methods video
M.F. Villamar, M.S. Volz, A. Datta, M. Bikson, A.F. DaSilva, F. Fregni. Technique and Considerations in the Use of 4×1 Ring High-definition Transcranial Direct Current Stimulation (HD-tDCS) JOVE 2013 (77) doi: 10.3791/50309.
Prof. Marom Bikson of The City College of New York lecture at the 2013 Harvard Medical School tDCS course on tDCS dose and mechanism. Topics include High-Definition tDCS (HD-tDCS), TDCS in children and in stroke, targeting, and optimization.
Jeremy Hill will speak on “Real-time interaction with brain processes”.
1 pm Aug 16th, BME Conference Room, 5th Floor, Grove School of Engineering
Brain Stimulation 6(3) 433-439
J. Medina, J. Beauvais, A. Datta, M. Bikson, H.B. Coslett, R.H. Hamilton.
Previous research on hemispatial neglect has provided evidence for dissociable mechanisms for egocentric and allocentric processing. Although a few studies have examined whether tDCS to posterior parietal cortex can be beneficial for attentional processing in neurologically intact individuals, none have examined the potential effect of tDCS on allocentric and/or egocentric processing.
Our objective was to examine whether transcranial direct current stimulation (tDCS), a noninvasive brain stimulation technique that can increase (anodal) or decrease (cathodal) cortical activity, can affect visuospatial processing in an allocentric and/or egocentric frame of reference.
We tested healthy individuals on a target detection task in which the target – a circle with a gap – was either to the right or left of the viewer (egocentric), or contained a gap on the right or left side of the circle (allocentric). Individuals performed the task before, during, and after tDCS to the posterior parietal cortex in one of three stimulation conditions – right anodal/left cathodal, right cathodal/left anodal, and sham.
We found an allocentric hemispatial effect both during and after tDCS, such that right anodal/left cathodal tDCS resulted in faster reaction times for detecting stimuli with left-sided gaps compared to right-sided gaps.
Our study suggests that right anodal/left cathodal tDCS has a facilitatory effect on allocentric visuospatial processing, and might be useful as a therapeutic technique for individuals suffering from allocentric neglect.
Read the Full Paper here: Medina_tDCS_BrainStimulation_2012
- Transcranial direct current stimulation;
- Current density modeling
Brain Stimulation 6 (2013): 704-705
Marom Bikson, Jacek Dmochowski, Asif Rahman
From the articles ” Computational models of transcranial stimulation predict brain current flow patterns for dose optimization. Translational animal models aim at elucidating the cellular mechanisms of neuromodu- lation. Here we identify and define a ubiquitous assumption under- lying both computational and animal models, referred to herein as the “quasi-uniform assumption”. Though we attempt to rationalize the biophysical plausibility for the quasi-uniform assumption based on the limited electric field gradients generated during stimulation, our goal is neither to justify nor repudiate it, but rather emphasize its implicit use in a majority of modeling and animal studies. ”
Cranial electrotherapy stimulation and transcranial pulsed current stimulation: A computer based high-resolution modeling study
Abhishek Datta, Jacek P. Dmochowski, Berkan Guleyupoglu, Marom Bikson, Felipe Fregni
Neuroimage. 2013 Jan 15;65:280-7. doi: 10.1016/j.neuroimage.2012.09.062. Epub 2012 Oct 5
► CES-induced current passes the skull and reaches cortical and subcortical areas.
► CES induced brain electric fields ranges from 0.2 to 0.6 V/m depending on the model.
► CES induced electrical current varies according to the electrode montage.
► Peak electric fields in some subcortical areas were similar to cortical regions.
► CES induced currents in the mid-brain exceed cortical values in some montages.
Download PDF CES_tPCS_model_Bikson_Neuroimage_2013
Picture from Davide Reato.