Recent scientific experimentation has duplicated several doppelganger effects when electrical stimulation was applied to the left temporoparietal junction of the brain of a patient.
The temporoparietal junction (TPJ) is an area of the brain where the temporal and parietal lobes meet at the posterior end of the Sylvian fissure. This area is known to play a crucial role in self-other distinction processes and theory of mind, and damage to this area has been implicated in producing out-of-body experiences. OBEs may also be induled by electrically stimulating the TPJ. Electromagnetic disruptions of the TPJ have been shown to affect individuals' abilities to make moral decisions.