Abstract
A recent study by Dutton et al. (J Relig Health 59:1567–1579. https://doi.org/10.1007/s10943-019-00926-3, 2020) found that the religiousness-IQ nexus is not on g when comparing different groups with various degrees of religiosity and the non-religious. It suggested, accordingly, that the nexus related to the relationship between specialized analytic abilities on the IQ test and autism traits, with the latter predicting atheism. The study was limited by the fact that it was on group-level data, it used only one measure of religiosity that measure may have been confounded by the social element to church membership and it involved relatively few items via which a Jensen effect could be calculated. Here, we test whether the religiousness-IQ nexus is on g with individual-level data using archival data from the Vietnam Experience Study, in which 4462 US veterans were subjected to detailed psychological tests. We used multiple measures of religiosity—which we factor-analysed to a religion-factor—and a large number of items. We found, contrary to the findings of Dutton et al. (2020), that the IQ differences with regard to whether or not subjects believed in God are indeed a Jensen effect. We also uncovered a number of anomalies, which we explore.
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References
Al-Bursan, I. S., Kirkegaard, E. O., Fuerst, J., Bakhiet, S. F. A., Al Qudah, M. F., Hassan, E. M. A. H., & Abduljabbar, A. S. (2018). Sex differences in 32,347 Jordanian 4th graders on the National Exam of Mathematics. Journal of Individual Differences, 40(2), 71–81. https://doi.org/10.1027/1614-0001/a000278
Barr, J. (1977). Fundamentalism. SCM.
Bayroff, A.G., & Fuchs, E.F. (1970). The armed services vocational aptitude battery. U. S. Army Behavior and Systems Research Laboratory. https://apps.dtic.mil/docs/citations/AD0706832.
Beaujean, A. A. (2014). Latent variable modeling using R: A step-by-step guide (1st ed.). Routledge.
Bruce, S. (2002). God is dead: Secularisation in the West. Blackwell.
Chalmers, P., Pritikin, J., Robitzsch, A., Zoltak, M., Kim, K., Falk, C. F., Meade, A., Schneider, L., King, D., Liu, C.-W., & Oguzhan, O. (2020). mirt: Multidimensional Item Response Theory (1.32.1) [Computer software]. https://CRAN.R-project.org/package=mirt.
Dahlstrom, W., Welsh, G., & Dahlstrom, L. (1975). An MMPI handbook volume I clinical interpretation a (revised). Minnesota: University of Minnesota Press.
Dutton, E. (2014). Religion and intelligence: An evolutionary analysis. Ulster Institute for Social Research.
Dutton, E. (2008). Meeting Jesus at University: Rites of passage and student evangelicals. Ashgate.
Dutton, E., & Van der Linden, D. (2017). Why is intelligence negatively associated with religiousness? Evolutionary Psychological Science, 3, 392–403. https://doi.org/10.1007/s40806-017-0101-0
Dutton, E., te Nijenhuis, J., Madison, G., Van der Linden, D., & Metzen, D. (2020). The myth of the stupid believer: The negative religiousness-IQ Nexus is not on general intelligence (g). Journal of Religion and Health, 59, 1567–1579. https://doi.org/10.1007/s10943-019-00926-3
Elwood, R. W. (1995). The California verbal learning test: Psychometric characteristics and clinical application. Neuropsychology Review, 5(3), 173–201. https://doi.org/10.1007/BF02214761
Freeman, A. (1993). God in us: A case for Christian humanism. SPCK.
Frisby, C. L., & Beaujean, A. A. (2015). Testing Spearman’s hypotheses using a bi-factor model with WAIS-IV/WMS-IV standardization data. Intelligence, 51, 79–97. https://doi.org/10.1016/j.intell.2015.04.007
Gilkey, C. (1924). Religion among American students. Journal of Religion, 1, 4.
Greve, K. W., Stickle, T. R., Love, J. M., Bianchini, K. J., & Stanford, M. S. (2005). Latent structure of the Wisconsin Card Sorting Test: A confirmatory factor analytic study. Archives of Clinical Neuropsychology, 20(3), 355–364. https://doi.org/10.1016/j.acn.2004.09.004
Fitchett, G., Murphy, P., Kravitz, H., Everson-Rose, S., Krause, N., & Powell, L. (2007). Racial/ethnic differences in religious involvement in a multi-ethnic cohort of midlife women. Journal for the Scientific Study of Religion, 46, 119–132. https://doi.org/10.1111/j.1468-5906.2007.00344.x
Hildebrandt, A., Lüdtke, O., Robitzsch, A., Sommer, C., & Wilhelm, O. (2016). Exploring factor model parameters across continuous variables with local structural equation models. Multivariate Behavioral Research, 51(2–3), 257–258. https://doi.org/10.1080/00273171.2016.1142856
Hills, P., Francis, L., Argyle, M., & Jackson, C. (2004). Primary personality trait correlates of religious practice and orientation. Personality and Individual Differences, 36, 61–73. https://doi.org/10.1016/S0191-8869(03)00051-5
Howells, T. (1928). A comparative study of those who accept as against those who reject religious authority. University of Iowa Studies in Character, 2, 3.
Jensen, A. R. (1980). Bias in mental testing. Free Press.
Jensen, A. R., & McGurk, F. C. J. (1987). Black-white bias in ‘cultural’ and ‘noncultural’ test items. Personality and Individual Differences, 8, 295–301. https://doi.org/10.1016/0191-8869(87)90029-8
Jensen, A. R. (1998). The g factor: The science of mental ability. Praeger.
Kanazawa, S. (2012). The intelligence paradox: Why the intelligent choice isn’t always the smart one. Wiley.
Kirkegaard, E. O. W. (2016). Using classical test theory statistics with Jensen’s method. R Notebook https://rpubs.com/EmilOWK/230077.
Kirkegaard, E. O. W., & Lasker, J. (2020). Intelligence and Religiosity among Dating Site Users. Psych, 2, 25–33. https://doi.org/10.3390/psych2010003
Kirkegaard, E. O. W., & Nyborg, H. (2020). Pupil size and intelligence: A large-scale replication study. Mankind Quarterly, 60(4), 525–538.
Lasker, J., Pesta, B. J., Fuerst, J. G. R., & Kirkegaard, E. O. W. (2019). Global ancestry and cognitive ability. Psych, 1(1), 431–459. https://doi.org/10.3390/psych1010034
Leckliter, I. N., Matarazzo, J. D., & Silverstein, A. B. (1986). A literature review of factor analytic studies of the WAIS-R. Journal of Clinical Psychology, 42(2), 332–342. https://doi.org/10.1002/1097-4679(198603)42:2%3c332::AID-JCLP2270420220%3e3.0.CO;2-2
Lynn, R., Harvey, J., & Nyborg, H. (2009). Average intelligence predicts atheism rates across 137 nations. Intelligence, 37(1), 11–15. https://doi.org/10.1016/j.intell.2008.03.004
Meade, A. W. (2010). A taxonomy of effect size measures for the differential functioning of items and scales. Journal of Applied Psychology, 95(4), 728–743. https://doi.org/10.1037/a0018966
Meisenberg, G., Rindermann, H., Patel, H., & Woodley, M. A. (2012). Is it smart to believe in God? The relationship of religiosity with education and intelligence. Temas Em Psicologia, 20, 101–120.
Nyborg, H. (2009). The intelligence-religiosity nexus: A representative study of white adolescent Americans. Intelligence, 37, 81–93. https://doi.org/10.1016/j.intell.2008.08.003
Nyborg, H., & Jensen, A. R. (2000). Black–white differences on various psychometric tests: Spearman’s hypothesis tested on American armed services veterans. Personality and Individual Differences, 28(3), 593–599. https://doi.org/10.1016/S0191-8869(99)00122-1
Nyborg, H., & Jensen, A. R. (2001). Occupation and income related to psychometric g. Intelligence, 29(1), 45–55. https://doi.org/10.1016/S0160-2896(00)00042-8
Onraet, E., Van Hiel, A., Dhont, K., Hodson, G., Schittekatte, M., & De Pauw, S. (2015). The association of cognitive ability with right–wing ideological attitudes and prejudice: A meta–analytic review. European Journal of Personality, 29(6), 599–621. https://doi.org/10.1002/per.2027
Pennycook, G., Ross, R. M., Koehler, D. J., & Fugelsang, J. A. (2016). Atheists and agnostics are more reflective than religious believers: Four empirical studies and a meta-analysis. PLoS ONE, 11(4), e0153039. https://doi.org/10.1371/journal.pone.0153039
Pew Research Center. (2019). In U.S., decline of Christianity continues at rapid pace. Pew Research Center’s Religion and Public Life Project. https://www.pewforum.org/2019/10/17/in-u-s-decline-of-christianity-continues-at-rapid-pace/.
Revelle, W. (2020). Psych: Procedures for psychological, psychometric, and personality research (1.9.12.31) [Computer software]. https://CRAN.R-project.org/package=psych.
Ritchie, S. J., Bates, T. C., & Plomin, R. (2015). Does learning to read improve intelligence? A longitudinal multivariate analysis in identical twins from age 7 to 16. Child Development, 86(1), 23–36. https://doi.org/10.1111/cdev.12272
Rindermann, H., Flores-Mendoza, C., & Woodley, M. A. (2012). Political orientations, intelligence and education. Intelligence, 40, 217–225. https://doi.org/10.1016/j.intell.2011.11.005
Robitzsch, A. (2020). sirt: Supplementary item response theory models (3.9-4) [Computer software]. https://CRAN.R-project.org/package=sirt.
Rosseel, Y., Jorgensen, T. D., Rockwood, N., Oberski, D., Byrnes, J., Vanbrabant, L., Savalei, V., Merkle, E., Hallquist, M., Rhemtulla, M., Katsikatsou, M., Barendse, M., & Scharf, F. (2020). lavaan: Latent variable analysis (0.6-7) [Computer software]. https://CRAN.R-project.org/package=lavaan.
Ruff, R. M., & Parker, S. B. (1993). Gender- and age-specific changes in motor speed and eye-hand coordination in adults: Normative values for the finger tapping and grooved pegboard tests. Perceptual and Motor Skills, 76(3_suppl), 1219–1230. https://doi.org/10.2466/pms.1993.76.3c.1219
Sherkat, D. (2002). Sexuality and religious commitment in the United States: An empirical examination. Journal for the Scientific Study of Religion, 41, 313–323. https://doi.org/10.1111/1468-5906.00119
Shin, M.-S., Park, S.-Y., Park, S.-R., Seol, S.-H., & Kwon, J. S. (2006). Clinical and empirical applications of the Rey–Osterrieth Complex Figure Test. Nature Protocols, 1(2), 892–899. https://doi.org/10.1038/nprot.2006.115
Sorjonen, K., Aurell, J., & Melin, B. (2017). Predicting group differences from the correlation of vectors. Intelligence, 64, 67–70. https://doi.org/10.1016/j.intell.2017.07.008
Templ, M., Alfons, A., Kowarik, A., & Prantner, B. (2015). VIM: Visualization and imputation of missing values. CRAN. http://cran.r-project.org/web/packages/VIM/index.html.
The Centers for Disease Control Vietnam Experience Study. (1988a). Health Status of Vietnam Veterans: I. Psychosocial Characteristics. JAMA, 259(18), 2701–2707. https://doi.org/10.1001/jama.1988.03720180027028
The Centers for Disease Control Vietnam Experience Study. (1988b). Health Status of Vietnam Veterans: II. Physical Health. JAMA, 259(18), 2708–2714. https://doi.org/10.1001/jama.1988.03720180034029
The Centers for Disease Control Vietnam Experience Study. (1988c). Health Status of Vietnam Veterans: III. Reproductive Outcomes and Child Health. JAMA, 259(18), 2715–2719. https://doi.org/10.1001/jama.1988.03720180041030
Tombaugh, T. N. (2006). A comprehensive review of the Paced Auditory Serial Addition Test (PASAT). Archives of Clinical Neuropsychology, 21(1), 53–76. https://doi.org/10.1016/j.acn.2005.07.006
Uebersax, J. S. (2015). Introduction to the tetrachoric and polychoric correlation coefficients. http://john-uebersax.com/stat/tetra.htm.
Wicherts, J. M., & Johnson, W. (2009). Group differences in the heritability of items and test scores. Proceedings of the Royal Society B: Biological Sciences, 276(1667), 2675–2683. https://doi.org/10.1098/rspb.2009.0238
Wicherts, J. M. (2017). Psychometric problems with the method of correlated vectors applied to item scores (including some nonsensical results). Intelligence, 60, 26–38. https://doi.org/10.1016/j.intell.2016.11.002
Witt, J. C. (1986). Review of the wide range achievement test-revised. Journal of Psychoeducational Assessment, 4(1), 87–90. https://doi.org/10.1177/073428298600400110
Zuckerman, M., Li, C., Lin, S., & Hall, J. (2020). The negative intelligence–religiosity relation: New and confirming evidence. Personal and Social Psychology Bulletin, 46, 856–868. https://doi.org/10.1177/0146167219879122
Zuckerman, M., Silverman, J., & Hall, J. (2013). The relation between intelligence and religiosity: A meta-analysis and some proposed explanations. Personality and Social Psychology Review, 17, 325–354. https://doi.org/10.1177/1088868313497266
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Dutton, E., Kirkegaard, E. The Negative Religiousness-IQ Nexus is a Jensen Effect on Individual-Level Data: A Refutation of Dutton et al.’s ‘The Myth of the Stupid Believer’. J Relig Health 61, 3253–3275 (2022). https://doi.org/10.1007/s10943-021-01351-1
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DOI: https://doi.org/10.1007/s10943-021-01351-1