Not far from the line of Heraclitus, Democritus, about 460 BC, extended the psychology of atomism of his predecessor Leucippus and taught that the human soul was a substance composed of very subtle and spherical atoms, as those of fire, and it was precisely because of their subtleness and sphericity that these atoms contribued to perpetual motion and heat of both the fire and the human soul. The soul, to Democritus, is a very subtle and volatile element that exists within the body (made of much more inert and gross material). This volatile soul spreads and penetrates all parts of body tissues and produces the different organs and limbs own vital functions... The thought, consciousness and sensation, particularly, would be the result of a form of variable combination of these ethereal and spherical atoms. The unstable combinations of these would be the source of psychic manifestations and their fluctuations over time. The atoms of the soul have a continuous circular motion which says…