Square of Opposition The square of opposition is a chart that was introduced within classical (categorical) logic to represent the logical relationships holding between certain propositions in virtue of their form. The square, traditionally conceived, looks like this: The four corners of this chart represent the four basic forms of propositions recognized in classical logic: A propositions, or universal affirmatives take the form: All S

Zhou Dunyi (Chou Tun-i, 1017-1073) Zhou Dunyi (sometimes romanized as Chou Tun-i and also known by his posthumous name, Zhou Lianxi) has long been highly esteemed by Chinese thinkers. He is considered one of the first “Neo-Confucians,” a group of thinkers who draw heavily on Buddhist and Daoist metaphysics to articulate a comprehensive, Confucian religious philosophy. This article begins with a brief look at Zhou’s

Theory of Mind Theory of Mind is the branch of cognitive science that investigates how we ascribe mental states to other persons and how we use the states to explain and predict the actions of those other persons. More accurately, it is the branch that investigates mindreading or mentalizing or mentalistic abilities. These skills are shared by almost all human beings beyond early childhood. They

Autism Autism, or the Autistic Spectrum Disorder, is a developmental psychological disorder that begins in the early stages of infancy and affects a child’s ability to develop social skills and engage in social activities. Three current psychological/philosophical theories attempt to explain autism as the result of certain cognitive deficiencies. Each theory takes a different approach to the autistic disorder and theorizes different causes. While no

Ludwig Wittgenstein (1889—1951) Ludwig Wittgenstein is one of the most influential philosophers of the twentieth century, and regarded by some as the most important since Immanuel Kant. His early work was influenced by that of Arthur Schopenhauer and, especially, by his teacher Bertrand Russell and by Gottlob Frege, who became something of a friend. This work culminated in the Tractatus Logico-Philosophicus, the only philosophy book

Laozi (Lao-tzu, fl. 6th cn. B.C.E.) Laozi is the name of a legendary Daoist philosopher, the alternate title of the early Chinese text better known in the West as the Daodejing, and the moniker of a deity in the pantheon of organized “religious Daoism” that arose during the later Han dynasty (25-220 C.E.). Laozi is the pinyin romanization for the Chinese characters which mean “Old