conditions and only two contain incantations to ward off evil. Ancient Greek philosophers, from Thales (fl. 550 BC) through even to the Roman period, developed an elaborate theory of what they termed the psuchẽ (psyche) (from which the first half of "psychology" is derived), as well as other "psychological" terms – nous, thumos, logistikon, etc. Classical Greece (fifth century BCE), philosophers taught “naturalism,” the belief that laws of nature shape our world, as opposed to gods and demons determining human fate. Alcmaeon, for example, believed the brain, not the heart, was the “organ of thought.”He tracked the ascending sensory nerves from the body to the brain, theorizing that mental activity originated in the CNS and that the cause of mental illness resided within the brain. He applied this understanding to classify mental diseases and treatments.The most influential of these psychologists are the accounts of Plato (especially in the Republic), Pythagoras and of Aristotle (esp. Peri Psyches, better known under its Latin title, De Anima). Plato's tripartite theory of the soul, Chariot Allegory and concepts such as eros defined the subsequent Western Philosophy views of the psyche and anticipated modern psychological proposals, such as Freud's id, ego and super-ego and libido; to the point that "in 1920, Freud decided to present Plato as the precursor of his own theory, as part of a strategy directed to define the scientific and cultural collocation of psychoanalysis". Hellenistic philosophers (viz., the Stoics and Epicurians) diverged from the Classical Greek tradition in several important ways, especially in their concern with questions of the physiological basis of the mind. The Roman physician Galen addressed these issues most elaborately and influentially of all. The Greek tradition influenced some Christian and Islamic thought on the topic. In the Judeo-Christian tradition, the Manual of Discipline (from the Dead Sea Scrolls, ca. 21 BC–61 AD) notes the division of human nature into two temperaments or opposing spirits of either veracity or perversity Walter M Freeman proposes that Thomism is the philosophical system explaining cognition that is most compatible with neurodynamics, in a 2008 article in the journal Mind and Matter entitled "Nonlinear Brain Dynamics and Intention According to Aquinas". In Asia, China had a long history of administering tests of ability as part of its education system. Chinese texts from 2500 years ago mention neuropsychiatric illness, including descriptions of mania and psychosis with or without epilepsy. “Imbalance” was the mechanism