I happen to study Psychic abilty in people. But Psychic power oringnates in the brain. The word "psychic" is derived from the Greek word psychikos ("of the mind" or "mental"), and refers in part to the human mind or psyche (ex. "psychic turmoil"). The Greek word also means "soul". In Greek mythology, the maiden Psyche was the deification of the human soul.
But the anwser I gave is also my hypothices.