Historically, psychology is a very young discipline dating back to the mid-1900's, but its foundation in philosophy and medicine dates back to a time of the Greek philosophers. The philosophy of Ancient Greece, leading to the Renaissance, is rich with the writings of the philosophers, Plato and Aristotle. The time following this gave history the great philosopher, Thomas Aquinas, the man who united Christian faith with Aristotelian logic [Bri02]. The end of the Renaissance and the 17th Century brought to history, the man who is considered the father of modern philosophy, mathematics, physiology, and psychology, René Descartes. Philosophy Descartes lived during the end of the Renaissance, and his life overlapped with great advances and changes to history and belief systems in science, philosophy, and the arts. In his summary, Goodwin explains, Descartes was a rationalist, believing that the way to true knowledge was through the systematic use of his reasoning abilities [CJa08]. Because he believed that some truths were universal and could be arrived at through reason and without the necessity of sensory experience, he was also a nativist. In addition, he was a duelist and an interactionist, believing that mind and body were distinct essences but that they had a direct influence on each other. Just prior to his death, Descartes published "The Passions of the Soul," which established his status as a pioneer psychologist and physiologist [Str01]. It is written to explain human emotion, but it also described what we know today as a reflex (an automatic stimulus-response reaction). Descartes' position on the mind-body question and included a description of his model of the nervous system activity which proved that the reflex was automatic because of the minds response to stimuli [Str01]. It is Descartes' who is most likely responsible for many of the themes that came from the late Renaissance that is incorporated into the science