[Simnibs-discuss] tRNS & bilateral hMT+ stimulation

[Simay Üner]

Hello Dr. Thielscher, 

Thanks for response. I will see if I order new electrodes for better focality.
Kind regards,

B. Simay Üner
PhD Student
Interdisciplinary Neuroscience Program
-

Bilkent University
simay.uner at bilkent.edu.tr
simay.uner at umram.bilkent.edu.tr

> On 13 Jun 2022, at 11:42, Axel Thielscher <axelt at drcmr.dk> wrote:
> 
> Hi,
> 
> 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.
> 
> Best,
> 
> Axel
> 
> 
> 
> 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
>> 
>> 
>> 
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> -- 
> Dr. Axel Thielscher
> Professor of Neurophysics and Neuroimaging
> Danish Research Center for Magnetic Resonance
> Copenhagen University Hospital Hvidovre
> DK-2650 Hvidovre, Denmark
> www.drcmr.dk <http://www.drcmr.dk/>
> &
> Department of Health Technology
> Technical University of Denmark
> DK-2800 Kgs. Lyngby
> http://www.healthtech.dtu.dk/ <http://www.healthtech.dtu.dk/><Thielscher_BrainBox_Saturday_2019_trns.pdf>

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