Conspiracy beliefs are widespread and can have detrimental consequences. As perceived social norms can exert a powerful influence on individuals, we investigated the relationship between perceived conspiracy belief norms and personal endorsement, and whether others’ conspiracy belief is overestimated. In Study 1, UK university students (N = 111) completed measures of their personal conspiracy beliefs and estimations of others’ beliefs (an in-group and an out-group they chose, and a prescribed in-group). Perceived in-groups’ belief strongly predicted personal conspiracy belief; perceived out-group’s belief did not. Studies 2 and 3 replicated these findings in a British community sample (N = 177) and in a UK parent sample (N = 197), focusing on antivaccine conspiracy theories. All studies demonstrated that people overestimate the conspiracy beliefs of others. This is the first demonstration of the association between perceived in-group conspiracy belief social norms and individuals’ personal conspiracy beliefs. Interventions challenging misperceived norms could be effective in reducing conspiracy beliefs.
AndersonK.SongK.LeeS.KrupkaE.LeeH.ParkM. (2017). Longitudinal analysis of normative energy use feedback on dormitory occupants. Applied Energy, 189, 623–639. https://doi.org/10.1016/j.apenergy.2016.12.086
3.
AronA.AronE. N.SmollanD. (1992). Inclusion of Other in the Self Scale and the structure of interpersonal closeness. Journal of Personality and Social Psychology, 63, 596–612. https://doi.org/10.1037/0022-3514.63.4.596
4.
AschS. E. (1951). Effects of group pressure upon the modification distortion of judgments. In GuetzkowH. (Ed.), Groups, leadership and men (pp. 177–190). Carnegie Press.
5.
BarronD.FurnhamA.WeisL.MorganK. D.TowellT.SwamiV. (2018). The relationship between schizotypal facets and conspiracist beliefs via cognitive processes. Psychiatry Research, 259, 15–20. https://doi.org/10.1016/j.psychres.2017.10.001
BrothertonR.FrenchC. C.PickeringA. D. (2013). Measuring belief in conspiracy theories: The generic conspiracist beliefs scale. Frontiers in psychology, 4, 279. https://doi.org/10.3389/fpsyg.2013.00279
8.
ChayinskaM.MinescuA. (2018). “They’ve conspired against us”: Understanding the role of social identification and conspiracy beliefs in justification of ingroup collective behavior. European Journal of Social Psychology, 48, 990–998. https://doi.org/10.1002/ejsp.2511
9.
ChoH.ChungS.FilippovaA. (2015). Perceptions of social norms surrounding digital piracy: The effect of social projection and communication exposure on injunctive and descriptive social norms. Computers in Human Behavior, 48, 506–515. https://doi.org/10.1016/j.chb.2015.02.018
10.
CialdiniR. B.KallgrenC. A.RenoR. R. (1991). A focus theory of normative conduct: A theoretical refinement and reevaluation of the role of norms in human behavior. In ZannaM. (Ed.), Advances in experimental social psychology (Vol. 24, pp. 201–234). Academic Press.
11.
CialdiniR. B.RenoR. R.KallgrenC. A. (1990). A focus theory of normative conduct: Recycling the concept of norms to reduce littering in public places. Journal of Personality and Social Psychology, 58, 1015–1026. https://doi.org/10.1037/0022-3514.58.6.1015
12.
CialdiniR. B.TrostM. R. (1998). Social influence: Social norms, conformity, and compliance. In GilbertD. T.FiskeS. T.LindzeyG. (Eds.), The handbook of social psychology (4th ed., Vol. 2, pp. 151–192). McGraw-Hill.
13.
CichockaA.GolecdeZavalaA.MarchlewskaM.OlechowskiM. (2015). Grandiose delusions: Collective narcissism, secure in-group identification and belief in conspiracies. In BilewiczM.CichockaA.SoralW. (Eds.), The psychology of conspiracy (pp. 42–61). Routledge.
14.
CichockaA.MarchlewskaM.GolecdeZavalaA. (2016). Does self-love or self-hate predict conspiracy beliefs? Narcissism, self-esteem and the endorsement of conspiracy theories. Social Psychological and Personality Science, 7, 157–166. https://doi.org/10.1177/1948550615616170
15.
CichockaA.MarchlewskaM.GolecdeZavalaA.OlechowskiM. (2015). “They will not control us”: Ingroup positivity and belief in intergroup conspiracies. British Journal of Psychology, 107, 556–576. https://doi.org/10.1111/bjop.12158
16.
DarwinH.NeaveN.HolmesJ. (2011). Belief in conspiracy theories. The role of paranormal belief, paranoid ideation and schizotypy. Personality and Individual Differences, 50, 1289–1293. https://doi.org/10.1016/j.paid.2011.02.027
17.
DempseyR. C.McAlaneyJ.BewickB. M. (2018). A critical appraisal of the social norms approach as an interventional strategy for health-related behavior and attitude change. Frontiers in Psychology, 9, Article 2180. https://doi.org/10.3389/fpsyg.2018.02180
18.
DickieR.RasmussenS.CainR.WilliamsL.MacKayW. (2018). The effects of perceived social norms on handwashing behaviour in students. Psychology, Health and Medicine, 23, 154–159. https://doi.org/10.1080/13548506.2017.1338736
19.
DouglasK. M.SuttonR. M. (2008). The hidden impact of conspiracy theories: Perceived and actual influence of theories surrounding the death of Princess Diana. The Journal of Social Psychology, 148, 210–221. https://doi.org/10.3200/SOCP.148.2.210-222
20.
DouglasK. M.SuttonR. M. (2011). Does it take one to know one? Endorsement of conspiracy theories is influenced by personal willingness to conspire. British Journal of Social Psychology, 50, 544–552. https://doi.org/10.1111/j.2044-8309.2010.02018.x
21.
DouglasK. M.SuttonR. M.CallanM. J.DawtryR. J.HarveyA. J. (2016). Someone is pulling the strings: Hypersensitive agency detection and belief in conspiracy theories. Thinking and Reasoning, 22, 57–77. https://doi.org/10.1080/13546783.2015.1051586
22.
DouglasK. M.SuttonR. M.CichockaA. (2017). The psychology of conspiracy theories. Current directions in psychological science, 26, 538–542. https://doi.org/10.1177/0963721417718261
23.
DouglasK. M.SuttonR. M.JolleyD.WoodM. J. (2015). The social, political, environmental, and health-related consequences of conspiracy theories. In BilewiczM.CichockaA.SoralW. (Eds.), The psychology of conspiracy (pp. 183–200). Routledge.
FaulF.ErdfelderE.BuchnerA.LangA.-G. (2009). Statistical power analyses using G*Power 3.1: Tests for correlation and regression analyses. Behavior Research Methods, 41, 1149–1160. https://doi.org/10.3758/BRM.41.4.1149
HayesA. F. (2017). Introduction to mediation, moderation, and conditional process analysis: A regression-based approach. The Guilford Press.
28.
HoggM. A.TurnerJ. C. (1987). Intergroup behaviour, self-stereotyping and the salience of social categories. British Journal of Social Psychology, 26, 325–340. https://doi.org/10.1111/j.2044-8309.1987.tb00795.x
29.
HornseyM. J.HarrisE. A.FieldingK. S. (2018). The psychological roots of anti-vaccination attitudes: A 24-nation investigation. Health Psychology, 37, 307–315. https://doi.org/10.1037/hea0000586
ImhoffR.ErbH. P. (2009). What motivates nonconformity? Uniqueness seeking blocks majority influence. Personality and Social Psychology Bulletin, 35, 309–320. https://doi.org/10.1177/0146167208328166
32.
ImhoffR.LambertyP. K. (2017). Too special to be duped: Need for uniqueness motivates conspiracy beliefs. European Journal of Social Psychology, 47, 724–734. https://doi.org/10.1002/ejsp.2265
33.
JolleyD.DouglasK. M. (2014a). The effects of anti-vaccine conspiracy theories on vaccination intentions. PLoS One, 9, Article e89177. https://doi.org/10.1371/journal.pone.0089177
34.
JolleyD.DouglasK. M. (2014b). The social consequences of conspiracism: Exposure to conspiracy theories decreases intentions to engage in politics and to reduce one’s carbon footprint. British Journal of Psychology, 105, 35–56. https://doi.org/10.1111/bjop.12018
35.
JolleyD.DouglasK. M. (2017). Prevention is better than cure: Addressing anti-vaccine conspiracy theories. Journal of Applied Social Psychology, 47, 459–469. https://doi.org/10.1111/jasp.12453
36.
JolleyD.MariS.DouglasK. M. (2020). Consequences of conspiracy theories. In ButterM.KnightP. (Eds.), Routledge handbook of conspiracy theories (pp. 231–241). Routledge.
37.
JolleyD.MeleadyR.DouglasK. M. (2019). Exposure to intergroup conspiracy theories promotes prejudice which spreads across groups. British Journal of Psychology, 111, 17–35. https://doi.org/10.1111/bjop.12385
38.
JolleyD.PatersonJ. L. (2020). Pylons ablaze: Examining the role of 5G COVID-19 conspiracy beliefs and support for violence. British Journal of Social Psychology, 59, 628–640. https://doi.org/10.1111/bjso.12394
LaBrieJ. W.HummerJ. F.NeighborsC.PedersenE. R. (2008). Live interactive group-specific normative feedback reduces misperceptions and drinking in college students: A randomized cluster trial. Psychology of Addictive Behaviors, 22, 141–148. https://doi.org/10.1037/0893-164X.22.1.141
LantianA.MullerD.NurraC.DouglasK. M. (2017). “I know things they don’t know!”: The role of need for uniqueness in belief in conspiracy theories. Social Psychology, 48, 160–173. https://doi.org/10.1027/1864-9335/a000306
43.
LantianA.MullerD.NurraC.KleinO.BerjotS.PantaziM. (2018). Stigmatized beliefs: Conspiracy theories, anticipated negative evaluation of the self, and fear of social exclusion. European Journal of Social Psychology, 48, 939–954. https://doi.org/10.1002/ejsp.2498
44.
LarimerM. E.NeighborsC. (2003). Normative misperception and the impact of descriptive and injunctive norms on college student gambling. Psychology of Addictive Behaviors, 17, 235–243. https://doi.org/10.1037/0893-164X.17.3.235
45.
LewandowskyS.OberauerK.GignacG. E. (2013). NASA faked the moon landing—Therefore, (climate)science is a hoax: An anatomy of the motivated rejection of science. Psychological Science, 24, 622–633. https://doi.org/10.1177/0956797612457686
46.
LynnM.SnyderC. R. (2002). Uniqueness seeking. In SnyderC. R.LopezS. J. (Eds.), Handbook of positive psychology (pp. 395–410). Oxford University Press.
47.
MarchE.SpringerJ. (2019). Belief in conspiracy theories: The predictive role of schizotypy, Machiavellianism, and primary psychopathy. PLoS One, 14, Article e0225964. https://doi.org/10.1371/journal.pone.0225964
48.
MarchlewskaM.CichockaA.ŁozowskiF.GórskaP.WiniewskiM. (2019). In search of an imaginary enemy: Catholic collective narcissism and the endorsement of gender conspiracy beliefs. Journal of Social Psychology, 159, 766–779. https://doi.org/10.1080/00224545.2019.1586637
49.
MashuriA.ZaduqistiE. (2013). The role of social identification, intergroup threat, and out-group derogation in explaining belief in conspiracy theory about terrorism in Indonesia. International Journal of Research Studies in Psychology, 3, 35–50. https://doi.org/10.5861/ijrsp.2013.446
50.
McAlaneyJ.BewickB.HughesC. (2011). The international development of the “social norms” approach to drug education and prevention. Drugs: Education, Prevention & Policy, 18, 81–89. https://doi.org/10.3109/09687631003610977
51.
MeiselM. K.GoodieA. S. (2014). Descriptive and injunctive social norms’ interactive role in gambling behavior. Psychology of Addictive Behaviors, 28, 592–598. https://doi.org/10.1037/a0036444
NeighborsC.DillardA. J.LewisM. A.BergstromR. L.NeilT. A. (2006). Normative misperceptions and temporal precedence of perceived norms and drinking. Journal of Studies on Alcohol, 67, 290–299. https://doi.org/10.15288/jsa.2006.67.290
54.
NeighborsC.LaBrieJ. W.HummerJ. F.LewisM. A.LeeC. M.DesaiS.KilmerJ. R.LarimerM. E. (2010). Group identification as a moderator of the relationship between perceived social norms and alcohol consumption. Psychology of Addictive Behaviors, 24, 522–528. https://doi.org/10.1037/a0019944
55.
NeighborsC.LarimerM. E.LewisM. A. (2004). Targeting misperceptions of descriptive drinking norms: Efficacy of a computer-delivered personalized normative feedback intervention. Journal of Consulting and Clinical Psychology, 72, 434–447. https://doi.org/10.1037/0022-006X.72.3.434
56.
OakesP. J. (1987). The salience of social categories. In TurnerJ. C.HoggM. A.OakesP. J.ReicherS. D.WetherellM. S. (Eds.), Rediscovering the social group: A self categorization theory (pp. 117-141). Oxford, UK: Basil Blackwell.
57.
OliverJ. E.WoodT. J. (2014). Conspiracy theories and the paranoid style(s) of mass opinion. American Journal of Political Science, 58, 952–966. https://doi.org/10.1111/ajps.12084
58.
PerkinsH. W.BerkowitzA. D. (1986). Perceiving the community norms of alcohol use among students: Some research implications for campus alcohol education programming. The International Journal of the Addictions, 21, 961–976. https://doi.org/10.3109/10826088609077249
59.
PerkinsJ. M.PerkinsH. W.CraigD. W. (2018). Misperceived norms and personal sugar-sweetened beverage consumption and fruit and vegetable intake among students in the United States. Appetite, 129, 82–93. https://doi.org/10.1016/j.appet.2018.06.012
60.
PerkinsJ. M.PerkinsH. W.CraigD. W. (2010). Misperceptions of peer norms as a risk factor for sugar-sweetened beverage consumption among secondary school students. Journal of the American Dietetic Association, 110, 1916–1921. https://doi.org/10.1016/j.jada.2010.09.008
61.
PischkeC. R.HelmerS. M.McAlaneyJ.BewickB. M.VriesackerB.Van HalG.. . . & ZeebH. (2015). Normative misperceptions of tobacco use among university students in seven European countries: Baseline findings of the ‘Social Norms Intervention for the prevention of Polydrug usE’study. Addictive Behaviors, 51, 158–164. https://doi.org/10.1016/j.addbeh.2015.07.012
62.
ReicherS.SpearsR.HaslamS. A. (2010). The social identity approach in social psychology. In WetherellM. S.MohantyC. T. (Eds.), Sage identities handbook (pp. 45–62). SAGE.
63.
ReidA. E.AikenL. S. (2013). Correcting injunctive norm misperceptions motivates behavior change: A randomized controlled sun protection intervention. Health Psychology, 32, 551–560. https://doi.org/10.1037/a0028140
64.
SchönbrodtF. D.PeruginiM. (2013). At what sample size do correlations stabilize?Journal of Research in Personality, 47, 609–612. https://doi.org/10.1016/j.jrp.2013.05.009
65.
SherifM. (1936). The psychology of social norms. Harper.
SmallpageS. M.EndersA. M.UscinskiJ. E. (2017). The partisan contours of conspiracy theory beliefs. Research and Politics. Advance online publication. https://doi.org/10.1177/2053168017746554
SwamiV.ColesR.StiegerS.PietschnigJ.FurnhamA.RehimS.VoracekM. (2011). Conspiracist ideation in Britain and Austria: Evidence of a monological belief system and associations between individual psychological differences and real-world and fictitious conspiracy theories. British Journal of Psychology, 102, 443–463. https://doi.org/10.1111/j.2044-8295.2010.02004.x
71.
SwamiV.FurnhamA.SmythN.WeisL.LayA.ClowA. (2016). Putting the stress on conspiracy theories: Examining associations between psychological stress, anxiety, and belief in conspiracy theories. Personality and Individual Differences, 99, 72–76. https://doi.org/10.1016/j.paid.2016.04.084
72.
TajfelH.TurnerJ. (1979). An integrative theory of intergroup conflict. In AustinW. G.WorchelS. (Eds.), The social psychology of intergroup relations (pp. 33–48). Brooks/Cole.
73.
TerryD. J.HoggM. A. (1996). Group norms and the attitude–behavior relationship: A role for group identification. Personality and Social Psychology Bulletin, 22, 776–793. https://doi.org/10.1177/0146167296228002
74.
ThorburnS.BogartL. M. (2005). Conspiracy beliefs about birth control: Barriers to pregnancy prevention among African Americans of reproductive age. Health Education & Behavior, 32, 474–487. https://doi.org/10.1177/1090198105276220
75.
TroppL. R.WrightS. C. (2001). Ingroup identification as the inclusion of ingroup in the self. Personality and Social Psychology Bulletin, 27, 585–600. https://doi.org/10.1177/0146167201275007
76.
TurnerJ. C. (1982). Towards a cognitive redefinition of the social group. In TajfelH. (Ed.), Social identity and intergroup relations (pp. 15–40). Cambridge University Press.
77.
TurnerJ. C. (1991). Social influence. Open University Press.
78.
Van ProoijenJ. W. (2017). Why education predicts decreased belief in conspiracy theories. Applied Cognitive Psychology, 31, 50–58. https://doi.org/10.1002/acp.3301
WaltersS. T.BennettM. E.NotoJ. V. (2000). Drinking on campus: What do we know about reducing alcohol use among college students?Journal of Substance Abuse Treatment,19, 223–228. https://doi.org/10.1016/S0740-5472(00)00101-X
81.
WoodM. J.DouglasK. M.SuttonR. M. (2012). Dead and alive: Beliefs in contradictory conspiracy theories. Social Psychological and Personality Science, 3, 767–773. https://doi.org/10.1177/1948550611434786
