Something one gets after a day of work staring at the computer or texting for hours upon hours or any continuous use of electronic technology until ones head feels as if it is ready to explode.
I texted Jenn so many times I had to take five Advil to get rid of my techneadache.
Jeff (now in a semi-vegetative state) used his brain waves (and some cunning technological advances) to move the cursor across the screen via technesis... it could arguably also be labelled as technology based 'psychotechnesis' (robosuperpowers).