Illusory truth effect

The illusory truth effect (also known as the illusion of truth effect, validity effect, truth effect, or the reiteration effect) is the tendency to believe false information to be correct after repeated exposure.^[1] This phenomenon was first identified in a 1977 study at Villanova University and Temple University.^[2]^[3] When truth is assessed, people rely on whether the information is in line with their understanding or if it feels familiar. The first condition is logical, as people compare new information with what they already know to be true. Repetition makes statements easier to process relative to new, unrepeated statements, leading people to believe that the repeated conclusion is more truthful. The illusory truth effect has also been linked to hindsight bias, in which the recollection of confidence is skewed after the truth has been received.

In a 2012 study, researchers discovered that familiarity can overpower rationality and that repetitively hearing that a certain statement is wrong can paradoxically cause it to feel right.^[4] Researchers attributed the illusory truth effect's impact even on participants who knew the correct answer to begin with, but were persuaded to believe otherwise through the repetition of a falsehood, to "processing fluency".

The illusory truth effect plays a significant role in fields such as advertising, news media, and political propaganda.

^ "The Truth Effect and Other Processing Fluency Miracles". Science Blogs. Archived from the original on 6 May 2021. Retrieved 30 December 2016.
^ Cite error: The named reference Hasher1977 was invoked but never defined (see the help page).
^ Newman, Eryn J.; Sanson, Mevagh; Miller, Emily K.; Quigley-Mcbride, Adele; Foster, Jeffrey L.; Bernstein, Daniel M.; Garry, Maryanne (September 6, 2014). "People with Easier to Pronounce Names Promote Truthiness of Claims". PLOS ONE. 9 (2): e88671. Bibcode:2014PLoSO...988671N. doi:10.1371/journal.pone.0088671. PMC 3935838. PMID 24586368.
^ Dreyfuss, Emily (February 11, 2017). "Want to Make a Lie Seem True? Say It Again. And Again. And Again". Wired. Archived from the original on 6 May 2021. Retrieved 31 October 2017.

[Science_Blogs-1] "The Truth Effect and Other Processing Fluency Miracles". Science Blogs. Archived from the original on 6 May 2021. Retrieved 30 December 2016.

[Hasher1977-2] Cite error: The named reference Hasher1977 was invoked but never defined (see the help page).

[PLOS_ONE-3] Newman, Eryn J.; Sanson, Mevagh; Miller, Emily K.; Quigley-Mcbride, Adele; Foster, Jeffrey L.; Bernstein, Daniel M.; Garry, Maryanne (September 6, 2014). "People with Easier to Pronounce Names Promote Truthiness of Claims". PLOS ONE. 9 (2): e88671. Bibcode:2014PLoSO...988671N. doi:10.1371/journal.pone.0088671. PMC 3935838. PMID 24586368.

[Wired-4] Dreyfuss, Emily (February 11, 2017). "Want to Make a Lie Seem True? Say It Again. And Again. And Again". Wired. Archived from the original on 6 May 2021. Retrieved 31 October 2017.

[1]

[2]

[3]

[4]