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Found the [link|http://www.skeptics.ca/articles/shermer-OBE.html|reference]:
Neuroscientist Michael Persinger, in his laboratory at Laurentian University in Sudbury, Canada, for example, can induce all of these experiences in subjects by subjecting their temporal lobes to patterns of magnetic fields (I tried it and had a mild out-of-body experience).There's lots of people shooting holes in Persinger's work, but if Shermer is saying he had a physical experience I'd say there's something to it.