"Plato (427-347 B.C.) in his philosophical writings, stressed the inner psychological reality in contrast to the reality of the external world. He believed that the human soul consists of three parts. 1) The rational soul, which resided in the brain. 2) The anima soul, controlling emotions and passions, was located in the chest. 3) The vegetative soul, controlling physiological needs, was located in the abdomen, When dreams occurred in sleep, the irrational soul reasserted themselves."