[bceyyeawauyy]

Usually a cap of electrodes on the scalp, sort of like the ones they put on your chest for an EKG.

It's read-only, ofc.

[lstodd]

> It's read-only, ofc.

Until one drives the electrodes with some voltage.

Then it becomes Transcranial Electrical Stimulation

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5405830/