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To catch you up on everything I know, TDCS (or tDCS — there’s something controversial about whether the ‘t’ should be capitalised or not, but I’m a tourist so I’m sticking with a big ‘T’ because it’s easier) is also called non-invasive brain stimulation. It’s non-invasive because nobody’s getting cut open. If you break all the words down it means you’re sending electricity through your head where it turns on, stays on for a while — usually 20 minutes — and then shuts off. During the session, the bit of brain directly beneath the anode (in my case, the red wire) is thought to become excited, whereas the region beneath the cathode (the black one) is thought to be inhibited.