Scepticism

Scepticism

TYPEPhilosophical stance / methodology

FIELDPhilosophy, science, critical thinking

ORIGINAncient Greek philosophy (Pyrrhonism); modern scientific scepticism traced to the Enlightenment

FIRST REPORTEDOrganised scientific scepticism movement founded 1976 (CSICOP)

ALSO KNOWN ASSkepticism (US spelling); scientific scepticism

STATUSAn active, ongoing methodology and organised movement

Scepticism, in the sense most relevant to the Vault, refers to scientific scepticism: the practice of applying scientific method and critical thinking to evaluate claims, particularly those concerning the paranormal, pseudoscience, and other extraordinary assertions, insisting on empirical evidence, reproducibility and falsifiability as the basis for acceptance. This distinguishes it from philosophical scepticism more broadly — a much older tradition concerned with the limits of knowledge itself, tracing back to ancient Greek Pyrrhonism — by focusing specifically on testable hypotheses rather than universal doubt.

Key principles

Burden of proof and "extraordinary claims"

Scientific scepticism generally places the burden of proof on whoever makes a claim, particularly one that diverges from established knowledge. The most widely known formulation of this principle — "extraordinary claims require extraordinary evidence," often called the Sagan standard after astronomer Carl Sagan, who popularised it in his 1979 book Broca's Brain and the 1980 television series Cosmos — has a more layered history than its popular attribution suggests. Sagan's phrasing was itself a direct paraphrase of sociologist Marcello Truzzi's earlier formulation, "an extraordinary claim requires extraordinary proof," used in a 1975 letter and again in Truzzi's own journal Zetetic Scholar in 1978 — which in turn echoed 18th-century French astronomer Pierre-Simon Laplace's principle that "the more extraordinary a fact is, the more it needs to be supported by strong evidence." The principle is closely related to Occam's razor, the general preference for simpler explanations over more complex ones, since an extraordinary claim can only reasonably be treated as the simplest explanation once genuinely extraordinary evidence supports it.

Falsifiability

Scientific sceptics generally require that a claim specify the conditions under which it could, in principle, be disproven — a claimed psychic ability, for instance, should predict outcomes distinguishable from chance under repeatable test conditions, with a claim's failure to do so, or its proponents' tendency to modify it after the fact to avoid disconfirmation, generally treated as grounds for rejection rather than continued acceptance.

The organised skeptical movement

The modern organised skeptical movement traces its origins to 1976, when philosopher Paul Kurtz founded the Committee for the Scientific Investigation of Claims of the Paranormal (CSICOP), now the Committee for Skeptical Inquiry (CSI), with support from prominent figures including Carl Sagan and Isaac Asimov, launching the Skeptical Inquirer magazine. Related organisations documented elsewhere in the Vault include the James Randi Educational Foundation, and prominent individual sceptics include Joe Nickell, a longtime CSI senior research fellow.

Internal criticism: "pseudoskepticism"

Scepticism's own most notable internal critique came from within its founding leadership. Sociologist Marcello Truzzi, a co-founder and initial co-chairman of CSICOP alongside Kurtz, resigned within roughly a year of the organisation's 1976 founding, after a dispute over whether the group's journal should include paranormal proponents and pro-paranormal research alongside sceptical material. Truzzi argued that many CSICOP members "tend to block honest inquiry... most of them are not agnostic toward claims of the paranormal; they are out to knock them... when an experiment of the paranormal meets their requirements, then they move the goal posts." He coined the term pseudoskepticism for this pattern — dismissing a claim as false without genuinely investigating it first — and promoted "zeteticism," from the Greek term for a "sceptical seeker," as an alternative he felt better captured the genuinely open-minded inquiry he associated with real scepticism. He went on to found the journal Zetetic Scholar in 1978 and, later, the Center for Scientific Anomalies Research (CSAR) in 1981, both intended to support more neutral, dialogue-based examination of unusual claims than he felt CSICOP was providing.

Truzzi's critique has echoed within the skeptical movement since. Parapsychologist-turned-sceptic Susan Blackmore, who became a CSICOP fellow in 1991, described what she called the "worst kind of pseudoskepticism" in 1994: some skeptics, she wrote, "clearly believe they know the right answer prior to inquiry" and "appear not to be interested in weighing alternatives, investigating strange claims, or trying out psychic experiences or altered states for themselves... but only in promoting their own particular belief structure."

VAULT ASSESSMENT

CLASSIFICATION

Philosophical stance and organised methodological movement, rather than a paranormal claim in itself

EARLIEST REPORT

Ancient Greek Pyrrhonism (philosophical scepticism generally); Enlightenment-era scientific scepticism (Laplace)

MODERN REPORTS

1976–present (organised scientific skeptical movement, CSICOP/CSI onward)

EVIDENCE

N/A — scepticism is a methodology for evaluating evidence, not itself a claim requiring evidential support

INVESTIGATIONS

Paul Kurtz; Carl Sagan; Marcello Truzzi; Joe Nickell; James Randi; Susan Blackmore

ASSESSMENT

Scientific scepticism provides much of the methodological toolkit the Vault itself relies on when assessing paranormal claims — burden of proof, falsifiability, and healthy caution about extraordinary claims. Its own internal history is a useful reminder that scepticism is not a monolithic or infallible practice: even the movement's own founding members have disputed where the line sits between rigorous inquiry and dismissive "pseudoskepticism," a tension worth bearing in mind when weighing any specific sceptical critique documented elsewhere in the Vault.

STATUS

N/A — this page documents a methodology and movement, not a single paranormal claim under evaluation

See also

• Joe Nickell
• James Randi Educational Foundation
• Anomalistic Psychology
• Forteana

External links

• Wikipedia — Committee for Skeptical Inquiry
• Wikipedia — Marcello Truzzi
• Wikipedia — Extraordinary claims require extraordinary evidence