[Simnibs-discuss] tDCS optimization for 4x1 set-up

Oula oulap at drcmr.dk
Wed Nov 9 08:33:06 CET 2022

Hi Steve,

We don't have an optimization procedure for the 4x1 yet. You can 
simulate different configurations with the currents you have specified 
and read the e-field at the target (and outside the target if you're 
interested in focality). Then pick the one that matches your 
optimization criteria best. For hitting a target the best configuration 
will most likely have the center electrode directly above the target. 
The radius of the montage (how far the surrounding electrodes are) will 
depend on how deep the target is.

The other option is to run the optimization as Axel pointed out in the 
previous answer and change the target intensity parameter so that the 
optimized currents match the ones you're after as you say.


On 11/1/22 16:33, Stephen Ball wrote:
> Hi There,
> I’m running a study with a similar set-up to this post: 
> [Simnibs-discuss] 4x1 Optamization (drcmr.dk) 
> <https://mailman.drcmr.dk/pipermail/simnibs-discuss/2022-June/000354.html> 
> using a 4x1 hd-tDCS arrangement, with 2mA on the anode and 4 cathodes 
> at -0.5mA. I’m hoping to optimize the location of these electrodes. Is 
> there still no optimization setting specific to this arrangement?
> If not, can I clarify your response in the link above – are you saying 
> tune the target intensity parameter and check the output for the 
> arrangement where the current at each electrode looks closest to what 
> we’re hoping to achieve?
> Best,
> Steve
> --------------------------------------------
> Stephen Ball
> --------------------------------------------
> PhD Student in Cognitive Neuroscience
> University of Manchester MRC DTP
> Division of Neuroscience and Experimental Psychology (DNEP)
> Zochonis Building
> stephen.ball-4 at postgrad.manchester.ac.uk
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