Persinger is the co-inventor of the 'God helmet' which when worn tries to evoke religious experiences by running an electromagnetic current into your skull, particularly the temporal lobes.
I saw a documentary about this guy; I think it was in the Through the Wormhole series. Or perhaps PBS Nova.
Cool stuff. It would stand to reason that if you think or feel it, the cause is chemistry in your brain and body. How else would you be aware of it?
That being said, do androids dream of electric sheep?
;)