 Mediumship is a modern form of shamanism and such ideas are very much like those developed by Edward Burnett Tylor in his theory of animism, in which there are other parallel worlds to our own, though invisible to us and not accessible to us in our state.A psychic is to be one of the connecting links between these worlds.A psychic is defined as someone endowed with exceptional sensitivity to the occult dimension, who experiences visions and revelations.