Ego replacement is a rare effect that can be described as the perception of one's sense of self becoming attributed with another. This can manifest in a number of ways such as (but not limited to) another human, animal, or alien consciousness. This delusion is extremely convincing and can result in shifts of perspective as well as delusions of grandeur. This effect is a form of ego dysmorphia and is most common during dissociative psychosis, but is also manifested during ego death on high dose psychedelics.
Compounds within our psychoactive substance index which may cause this effect include: