Electrically stimulated "virtual reality"

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Michael Persinger of Laurentian University has done some promising research by applying computer-controlled selenoid magnets to the heads of test subjects. He alters brain activity in the temporal lobe, and has managed to produce a variety of altered states, including hallucinations.

Since the temporal lobe is arguably where the brain "creates" reality, I wonder how far way we are from achieving a "full-immersion" virtual environment by way of precise electromagnetic fields to the brain. How small would the 'trodes have to be--assuming it's possible to create an interactive hallucination without using intrusive surgery?

--Mac Tonnies

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