Within the sociology of knowledge, agnotology (formerly agnatology) is the study of deliberate, culturally induced ignorance or doubt, typically to sell a product, influence opinion, or win favour, particularly through the publication of inaccurate or misleading scientific data (disinformation). More generally, the term includes the condition where more knowledge of a subject creates greater uncertainty.
Stanford University professor Robert N. Proctor cites the tobacco industry's public relations campaign to manufacture doubt about the adverse health effects of tobacco use as a prime example. David Dunning of Cornell University warns that powerful interests exploit the internet to propagate ignorance."
Agents of culturally induced ignorance include the media, corporations, and government agencies, through secrecy and suppression of information, document destruction, and selective memory. Passive causes include structural information bubbles, including those that reflect racial and class differences, based on access to information.
Agnotology also focuses on how and why diverse knowledge does not "come to be," or is ignored or delayed. For example, knowledge about plate tectonics was censored and delayed for at least a decade because some evidence remained classified military information related to undersea warfare.
The availability of large amounts of knowledge may allow people to cherry-pick information (whether or not factual) that reinforces their beliefs and ignore inconvenient knowledge by consuming repetitive or fact-free entertainment. Evidence conflicts on how television affects viewers.
The term was coined in 1992 by linguist and social historian Iain Boal at the request of Stanford University professor Robert N. Proctor. The word is based on the Neoclassical Greek word agnōsis (ἄγνωσις, 'not knowing'; cf. Attic Greek ἄγνωτος, 'unknown' and -logia (-λογία).