[Nov 18, 2016 Update: Proceeding of WorkShop Published: Download PDF: 23657]
Dr. Marom Bikson will speak at the
Forum on Neuroscience and Nervous System Disorders
Hosted by the National Academies. Event Page
Slides here: QuantificationOfNeuromodulationDose_Bikson
When: June 14, 2016 – June 15, 2016 (1:30 PM Eastern). Dr. Bikson lectures on June 15 at 9:55 AM
Where: Keck Center • 500 Fifth St. NW, Washington, DC 20001
New Paper: Tolerability of Repeated Application of Transcranial Electrical Stimulation with Limited Outputs to Healthy Subjects
Brain Stimulation 2016 May 24. pii: S1935-861X(16)30104-8. doi: 10.1016/j.brs.2016.05.008. [Epub ahead of print]
Abstract: The safety and tolerability of limited output tES in clinical populations support a non-significant risk designation. The tolerability of long-term use in a healthy population had remained untested. We tested the tolerability and compliance of two tES waveforms, tDCS and modulated high frequency transcranial pulsed current stimulation (MHF-tPCS) compared to sham-tDCS, applied to healthy subjects for three to five days (17–20 minutes per day) per week for up to six weeks in a communal setting. MHF-tPCS consisted of asymmetric high-frequency pulses (7–11 kHz) having a peak amplitude of 10–20 mA peak, adjusted by subject, resulting in an average current of 5–7 mA. A total of 100 treatment blind healthy subjects were randomly assigned to one of three treatment groups: tDCS (n = 33), MHF-tPCS (n = 30), or sham-tDCS (n = 37). In order to test the role of waveform, electrode type and montage were fixed across tES and sham-tDCS arms: high-capacity self-adhering electrodes on the right lateral forehead and back of the neck. We conducted 1905 sessions (636 sham-tDCS, 623 tDCS, and 646 MHF-tPCS sessions) on study volunteers over a period of six weeks. Common adverse events were primarily restricted to influences upon the skin and included skin tingling, itching, and mild burning sensations. The incidence of these events in the active tES treatment arms (MHF-tPCS, tDCS) was equivalent or significantly lower than their incidence in the sham-tDCS treatment arm. Other adverse events had a rarity (<5% incidence) that could not be significantly distinguished across the treatment groups. Some subjects were withdrawn from the study due to atypical headache (sham-tDCS n = 2, tDCS n = 2, and MHF-tPCS n = 3), atypical discomfort (sham-tDCS n = 0, tDCS n = 1, and MHF-tPCS n = 1), or atypical skin irritation (sham-tDCS n = 2, tDCS n = 8, and MHF-tPCS n = 1). The rate of compliance, elected sessions completed, for the MHF-tPCS group was significantly greater than the sham-tDCS group’s compliance (p = 0.007). There were no serious adverse events in any treatment condition. We conclude that repeated application of limited output tES across extended periods, limited to the hardware, electrodes, and protocols tested here, is well tolerated in healthy subjects, as previously observed in clinical populations.
3rd BIC Symposium event website
The Brain Imaging Center at Icahn School of Medicine at Mount Sinai
Davis Auditorium (2nd floor) Hess Center for Science and Medicine
October 19, 2016
1:55-2:20 Lucas Parra, PhD (CCNY) – “On Brainwaves and Videos and Video Games”
3:15-3:40 Marom Bikson, PhD (CUNY) – “Non-invasive Brain Stimulation and Imaging” Download slides: marombikson_brainstimwithimaging_2016
Marom Bikson lectures at the Interdisciplinary Late-Summer School on Non-Invasive Brain Stimulation in Freiburg, Germany (Oct 12-16, 2016). Event details here
Download Bikson’s slides on “Translational aspects of tDCS: from rodent to humans” – bikson_nibs_summerschool_2016
Download Bikson slides on “Modeling tDCS current flow: Hand-on practical” modelingworkshop_summer
Neuromodulation: Technology at the Neural Interface, Clinical Research
The Influence of Skin Redness on Blinding in Transcranial Direct Current Stimulation Studies: A Crossover Trial
Fernando Ezquerro, Adriano H. Moffa, Marom Bikson, Niranjan Khadka, Luana V. M. Aparicio, Bernardo de Sampaio-Junior, Felipe Fregni, Isabela M. Bensenor, Paulo A. Lotufo, Alexandre Costa Pereira, Andre R. Brunoni
To evaluate whether and to which extent skin redness (erythema) affects investigator blinding in transcranial direct current stimulation (tDCS) trials.
Material and Methods
Twenty-six volunteers received sham and active tDCS, which was applied with saline-soaked sponges of different thicknesses. High-resolution skin images, taken before and 5, 15, and 30 min after stimulation, were randomized and presented to experienced raters who evaluated erythema intensity and judged on the likelihood of stimulation condition (sham vs. active). In addition, semi-automated image processing generated probability heatmaps and surface area coverage of erythema. Adverse events were also collected.
Erythema was present, but less intense in sham compared to active groups. Erythema intensity was inversely and directly associated to correct sham and active stimulation group allocation, respectively. Our image analyses found that erythema also occurs after sham and its distribution is homogenous below electrodes. Tingling frequency was higher using thin compared to thick sponges, whereas erythema was more intense under thick sponges.
Optimal investigator blinding is achieved when erythema after tDCS is mild. Erythema distribution under the electrode is patchy, occurs after sham tDCS and varies according to sponge thickness. We discuss methods to address skin erythema-related tDCS unblinding.
Full PDF: Erythema and tDCS
Nature Scientific Reports
In-vivo Imaging of Magnetic Fields Induced by Transcranial Direct Current Stimulation (tDCS) in Human Brain using MRI
Mayank V. Jog, Robert X. Smith, Kay Jann, Walter Dunn, Belen Lafon, Dennis Truong, Allan Wu, Lucas Parra, Marom Bikson & Danny J. J. Wang
Transcranial direct current stimulation (tDCS) is an emerging non-invasive neuromodulation technique that applies mA currents at the scalp to modulate cortical excitability. Here, we present a novel magnetic resonance imaging (MRI) technique, which detects magnetic elds induced by tDCS currents. This technique is based on Ampere’s law and exploits the linear relationship between direct current and induced magnetic elds. Following validation on a phantom with a known path of electric current and induced magnetic eld, the proposed MRI technique was applied to a human limb (to demonstrate in- vivo feasibility using simple biological tissue) and human heads (to demonstrate feasibility in standard tDCS applications). The results show that the proposed technique detects tDCS induced magnetic elds as small as a nanotesla at millimeter spatial resolution. Through measurements of magnetic elds linearly proportional to the applied tDCS current, our approach opens a new avenue for direct in-vivo visualization of tDCS target engagement.
Full PDF: srep34385
Dr. Lucas Parra, Dr. Jacek Dmochowski, and Dr. Marom Bikson are speakers at the National Institute of Health (NIH) workshop on Transcranial Electrical Stimulation. Sept 29-30, 2016. Dr. Bikson is also a co-organizer of the event.
Full event details here (watch it on WebX)
Synaptic Plasticity Mechanism Explains the Specificity of tDCS- Lucas Parra, PhD– Download Parra talk slides: talk-plasticity-september-2016
Computational Modeling-assisted Design of tDCS Protocols- Marom Bikson, PhD. — Download Bikson talk slides: nih_2016_bikson
Targeted Stimulation of Active Brain Sources Using Electromagnetic Reciprocity- Jacek Dmochowski, PhD
D.Q. Truong. D. Adair, M. Bikson. Computer-based models of tDCS of tACS in Transcranial Direct Current Stimulation in Neuropsychiatric Disorders: Clinical Principles ed. M.Nitsche, C. Loo and A. Brunoni 2016 10.1007/978-3-319-33967-2_5 p.47-66 . PDF:computermodels_chapter
D. Ling, A. Rahman, M. Jackson M. Bikson Animal studies in the field of transcranial electric stimulation in Transcranial Direct Current Stimulation in Neuropsychiatric Disorders: Clinical Principles M.Nitsche, C. Loo and A. Brunoni 2016 10.1007/978-3-319-33967-2_5 p.67-83 PDF: animalstudies_chapter