[Simnibs-discuss] tRNS & bilateral hMT+ stimulation

Axel Thielscher axelt at drcmr.dk
Mon Jun 13 10:42:33 CEST 2022


attached are a few slides on how tDCS simulations relate to tACS and tRNS.

As long as you have only one one-channel stimulator, bilateral 
stimulation will be unfocal. You can consider combining two one-channel 
stimulators to have to center-surround montages above the two V5.



On 10-06-2022 13:04, Simay Üner wrote:
> Hello,
> First of all, thank you for developing this simulation software as it 
> is really useful for us researchers!
> I am a PhD student who will use tES soon, but both the project and 
> this stimulation/simulation literature is very new to me, so I need 
> some clarifications if you don't mind helping.
> We have NeuroConn DC-Stimulator-Plus 
> <https://www.neurocaregroup.com/dc_stimulator_plus> here in the lab, 
> and I want to stimulate hMT+ (V5) *bilaterally *with tRNS. The problem 
> is that only_ one-channel stimulation_ is possible with this device.
> First,
> - Because I am going to use tRNS mode instead of giving a direct 
> current stimulation, I couldn't be sure that the simulation I run on 
> this software is applicable for tACS experiments, especially for tRNS. 
> If it is not applicable, is there anything you can recommend to me to 
> visualize tRNS effect with one channel stimulation? I want to be sure 
> about the regions that will be affected by my stimulation, and if tDCS 
> simulations are not applicable for this, I need to find another way.
> Second,
> - If applicable for tRNS, when I run simulations for tDCS -because of 
> one channel stimulation- I saw that a huge area between my two 
> stimulation sites (probably around PO7-PO8 electrode regions) are 
> substantially affected by stimulation, regardless of the current 
> applied. I am sure that you are much more familiar with the procedure, 
> so I wanted to ask if there is anything you can recommend to do to 
> stimulate *only electrode positions *(and near areas of course) but 
> not the regions in between with tRNS, considering that I don't have 
> any chance to use multichannel systems.
> I have to note that the smallest electrodes I have are rectangular 3cm 
> x 3cm (and sponges), and new orders are delivered to Turkey in several 
> months which will, unfortunately, affect my schedule.
> Any response and recommendation will be very helpful.
> Thank you for your time,
> Kind regards,
> --
> *Simay Üner*
> PhD Student in Neuroscience
> Bilkent University, Ankara, Turkey
> _______________________________________________
> Simnibs-discuss mailing list
> Simnibs-discuss at drcmr.dk
> https://mailman.drcmr.dk/mailman/listinfo/simnibs-discuss

Dr. Axel Thielscher
Professor of Neurophysics and Neuroimaging
Danish Research Center for Magnetic Resonance
Copenhagen University Hospital Hvidovre
DK-2650 Hvidovre, Denmark
Department of Health Technology
Technical University of Denmark
DK-2800 Kgs. Lyngby
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