Skepticism (philosophy)

Skepticism (philosophy)
Name	Skepticism (philosophy)
Region	Western philosophy; Indian philosophy; Chinese philosophy
Era	Antiquity to Contemporary
Main interests	Epistemology; Metaphysics; Philosophy of Mind
Notable figures	Pyrrho of Elis; Sextus Empiricus; René Descartes; David Hume; Immanuel Kant; G. E. Moore; Ludwig Wittgenstein

Skepticism (philosophy) is a philosophical position that questions the possibility, scope, or justification of knowledge and justified belief. It engages with the works of figures such as Pyrrho of Elis, Sextus Empiricus, René Descartes, David Hume, and Immanuel Kant, and it has influenced institutions and movements including the Royal Society, University of Paris, University of Oxford, University of Cambridge, and Princeton University. Skepticism intersects with debates addressed by thinkers like Plato, Aristotle, Epicurus, Marcus Aurelius, Buddha, Nagarjuna, Zhuangzi, and Confucius.

Overview and Definitions

Skepticism broadly distinguishes between methodological skepticism exemplified by René Descartes and radical or Pyrrhonian skepticism traced to Pyrrho of Elis and recorded by Sextus Empiricus, while analytic responses appear in the writings of G. E. Moore, Bertrand Russell, and Ludwig Wittgenstein. Definitions typically contrast epistemic skepticism about knowledge with practical skepticism in the traditions of Marcus Aurelius and Michel de Montaigne, and with scientific skepticism promoted by organizations like the Royal Society and the Committee for Skeptical Inquiry. Debates often invoke classical texts such as Plato's dialogues, Aristotle's treatises, and modern works by John Locke, George Berkeley, Thomas Reid, Immanuel Kant, and William James.

Historical Development

Antique skepticism arises in the Hellenistic period with figures associated with Pyrrho of Elis, followers recorded by Sextus Empiricus, and interlocutors in Aristotle's and Plato's circles; later, Roman authors like Cicero transmitted skeptical themes to medieval scholasticism through institutions such as the University of Paris and patrons like Charlemagne and Pope Gregory I. During the Renaissance and Early Modern era, skeptics and anti-skeptics appear in exchanges among Michel de Montaigne, René Descartes, Blaise Pascal, Thomas Hobbes, and Baruch Spinoza, while empiricism advanced by John Locke, George Berkeley, and David Hume reframed skeptical problems for the Royal Society and continental academies. The 19th and 20th centuries saw responses in the work of Immanuel Kant, G. W. F. Hegel, Friedrich Nietzsche, William James, Bertrand Russell, G. E. Moore, Ludwig Wittgenstein, and analytic movements centered at Cambridge University and Princeton University, and continental responses at institutions like the Sorbonne and Humboldt University of Berlin.

Types and Methods of Skepticism

Pyrrhonian skepticism, associated with Pyrrho of Elis and chronicled by Sextus Empiricus, advocates epoché (suspension of judgment) and ataraxia, while Academic skepticism linked to the Platonic Academy holds that certain knowledge is unattainable but probabilistic judgment remains possible, as debated by Cicero and later by Marcus Tullius Cicero's readers. Cartesian methodological skepticism, pursued by René Descartes in the Meditations, uses hyperbolic doubt to secure indubitable foundations; empiricist skepticism from David Hume questions induction and causation, prompting critiques by Immanuel Kant in the Critique of Pure Reason. Internalist and externalist forms of epistemic skepticism engage responses from Edmund Gettier-related debates, Alvin Plantinga's reformed epistemology, and reliabilist accounts developed by Hilary Putnam, W. V. O. Quine, and Donald Davidson.

Major Skeptical Arguments and Responses

Classic skeptical arguments include the problem of the criterion associated with Sextus Empiricus, the dream argument and evil demon hypothesis of René Descartes, and Hume's critique of induction and causation, which provoked Immanuel Kant's critical philosophy and later analytic counters by G. E. Moore's common-sense arguments and Bertrand Russell's epistemic modesty. Contemporary rejoinders involve contextualism defended by philosophers at UCLA and Oxford University such as Keith DeRose and Edwin D. L. Baker, invariantist replies by Timothy Williamson and Hilary Kornblith, and pragmatic responses drawn from William James and C. S. Peirce's fallibilism, while reliabilist, virtue epistemology, and epistemic entitlement approaches are associated with Ernest Sosa, John Greco, and Thomas Reid's revivalists.

Influence on Science and Epistemology

Skepticism shaped methodological reforms in the Scientific Revolution influenced by figures like Francis Bacon, Galileo Galilei, and Isaac Newton, and it informed institutional practices at the Royal Society and later scientific academies across Europe and the United States including Harvard University and Massachusetts Institute of Technology. Humean skepticism about induction precipitated philosophical projects by Karl Popper at the London School of Economics and probabilistic accounts by Bruno de Finetti and Richard Jeffrey, while Bayesian epistemology popularized by Thomas Bayes and Pierre-Simon Laplace offers formal tools responding to skeptical challenges, later advanced at centers such as Stanford University and Columbia University.

Contemporary Debates and Applications

Current debates link philosophical skepticism to cognitive science labs at MIT, Harvard University, and University College London exploring perception and illusion, to legal epistemology in courts influenced by precedents in United States jurisprudence, and to artificial intelligence research at OpenAI, DeepMind, and Google concerning knowledge representation and uncertainty. Applied skepticism undergirds public skepticism movements like the Committee for Skeptical Inquiry and the James Randi Educational Foundation, informs journalism practices at outlets including The New York Times and BBC, and animates ethical discussions in bioethics committees at World Health Organization and National Institutes of Health panels. Contemporary philosophical literature continues at journals published by Oxford University Press, Cambridge University Press, and Routledge and in conferences hosted by societies such as the American Philosophical Association and the Aristotelian Society.

Category:Epistemology