Neuroscientists’ Open Letter To DIY Brain Hackers

We now know that if you take the same subject and do tDCS with exactly the same settings on different days, they can have very different responses. We know there’s a huge amount that can actually change what effect tDCS has. What you’re doing at the time tDCS is administered, or before tDCS is administered, has an effect. There are so many different things that can have an effect – your age, your gender, your hormones, whether you drank coffee that morning, whether you’ve had exposure to brain stimulation previously, your baseline neurotransmitter level — all of this stuff can affect what tDCS does to your brain. And some of those things vary on a day-to-day basis.

via http://www.wbur.org/commonhealth/2016/07/11/caution-brain-hacking