ABSTRACT
From the dawn of philosophy in Greek thought great attention was paid to the phenomena of consciousness, which were variously defined. Originally the soul was conceived as material, as air, or as finest matter or fire. There was then no great difficulty in the interaction of a material mind with a material body. With the later Greek thought of Plato and Aristotle the soul had become a non-material entity that interacts with the body, but that raised no problem with the primitive Greek science. At that time the first great physician, Hippocrates, was a dualist, stating that in movement the brain is the interpreter of consciousness and it tells the limbs how to act, and it also is the messenger to consciousness. But of course there were but the most primitive ideas about how this happens. In summary, the usual Greek philosophical belief was dualism and interactionism.
