Dr. Persinger's God Helmet
The term God Helmet refers to a controversial experimental apparatus in neurotheology. The apparatus, placed on the head of an experimental subject, stimulates the brain with magnetic fields. Persinger reports that at least 80 percent of his participants experience a presence beside them in the room, which they variously say feels like God or someone they knew who had died.
The leading researcher in this area is Michael Persinger. Persinger uses a modified snowmobile helmet or a head-circlet device nicknamed the Octopus that contain solenoids which create a weak but complex magnetic field over the brain's right-hemisphere parietal and temporal lobes.
Dr. Persinger studies the brain to better understand the origin of religious experiences.
The God Helmet and Michael Persinger: brief overview.