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tES and suprathreshold E

Posted: Tue Nov 20, 2018 10:23 pm
by plasticity
In transcranial electric stimulation (TES) the applied E field amplitude at the level of the targeted cortex underneath the electrode is approximately 0.5V/m. Typically not more than 2mA of current is applied at the scalp electrodes to achieve such an E field amplitude. It’s not possible to go much higher than 0.5V/m because the current applied at the electrode is mostly shunted through the scalp and above 2mA pain and excessive heating will occur. TES uses frequencies in the range of 0-100 typically.

Here’s my question: With frequencies in the TES range what E field amplitude would be needed to reach threshold? Got any references?

Thanks again!!

Re: tES and suprathreshold E

Posted: Wed Nov 21, 2018 10:01 am
by ted
PubMed is your friend. There is an extensive literature on electrostimulation, including but not limited to the topic of exposure standards. You might start by looking at
author = {Reilly, J Patrick},
title = {Survey of numerical electrostimulation models},
journal = {Physics in Medicine and Biology},
year = {2016},
volume = {61},
number = {12},
month = {Jun},
pages = {4346--4363},
doi = {10.1088/0031-9155/61/12/4346},
url = {},
pmid = {27223870},
Side comment: this paper happens to have an entry in ModelDB.

Re: tES and suprathreshold E

Posted: Fri Nov 23, 2018 4:26 pm
by plasticity
Thanks, Ted!