That is a very interesting article if it is the one Hercdoc links to.
There was a Doctor Michael Persinger who was working on creating similar hallucinations with magnetic fields a few years ago.
Unfortunately he phrased it in terms that offended the more religious people (some people referred to his device as the God Helmet) and his research was pretty well stifled.
It has links to temporal lobe epilepsy too.
There is still a lot of controversy over the results with at least one other research team being unable to repeat the experiments.