Are there two souls in a Body?

All over the world Psychics claim to be able to (through mediums) call the souls of persons long dead and are arranging for their interviews with their relatives yet it is a accepted fact atleast in Sanatan Dharm that every soul reincarnates in to a different body and this goes on.Are there then two souls in a body ? One of them after death goes on its further journey of Reincrnation while the other one stays on and is available to communicate with those who have the power to do or arrange for this.Or does at death the Soul divides in to two and one takes rebirth and the other stays on in its own world somewhere in this Universe or beyond .Will somebody please enlighten me.