The Sydney work is about magnetic stimulation, while the Oxford work is electrical, but the effects sound pretty similar. Electrical techniques are cheaper, but harder to control (2d vs 3d). The drawing article appeared in the New York Times Magazine, but the current web page lacks the drawings.
The example of math learning seemed pretty contrived to me. Here is an 8 year old article on transcranial stimulation for drawing. If nothing else, look at the drawings made by the journalist.
The Sydney work is about magnetic stimulation, while the Oxford work is electrical, but the effects sound pretty similar. Electrical techniques are cheaper, but harder to control (2d vs 3d). The drawing article appeared in the New York Times Magazine, but the current web page lacks the drawings.