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The decline of g

Dec 10th, 2019
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  1. I. We know IQ is useful because of:
  2. A. Longitudinal data on the effect on life outcomes in comparison to other variables
  3. 1. Longitudinal, Sample size [Source 1]
  4. B. The predictive power for job performance in comparison to other variables
  5. 1. Power in comparison to other variables holding up very well
  6. [Sources 2 & 3]
  7. 2. Power by level of complexity [Source 4]
  8. C. Predicting criminal behavior
  9. 1. Longitudinal data, replication [Sources 5, 6, 7, & 8]
  10. D. Correlating with how smart people think each other are
  11. 1. Spousal correlation vs peer correlation as evidence of effect of relationship depth [Source 9, 10, 11, & 12]
  12. E. The nature of intelligence testing and g
  13. 1. Intelligence researchers started out with the multiple intelligences theory, but through it discovered g which is really powerful and probably explains why IQ tests are useful. [Source 13]
  14.  
  15.  
  16. II. We’re facing an intelligence crisis.
  17. A. IQ is heritable
  18. It is plausible for it to be heritable. [Sources 14, 15, 16, & 17]
  19. Twin studies show heritability. [Source 18, 19 & 20]
  20. More g loaded subtests are more heritable. [Source 25]
  21.  
  22. B. IQ is going down
  23. Even high IQ teens have less sex. [Source 22]
  24. Didn’t always used to be this way. [Sources 26 & 27]
  25. G is negatively correlated with the strength of the Flynn
  26. effect. [Source 21]
  27. The Flynn effect has signs of slowing down, stopping or even reversing in the west. [Source 23]
  28. G is in fact going down. [Source 24]
  29.  
  30.  
  31. III. Idiocracy wasn’t a comedy, it was a documentary. Facts can’t be ignored because of their inconvenience because if you ignore a problem, or recognize a problem but ignore the cause and attempt to treat a fake cause or treat the symptoms, the problem is just going to grow and grow until it blows up in your face.
  32.  
  33. Works Cited:
  34.  
  35. [1] Strenze, Tarmo. “Intelligence and Socioeconomic Success: A Meta-Analytic Review of Longitudinal Research.” Intelligence, vol. 35, no. 5, 2007, pp. 401–26, doi:10.1016/j.intell.2006.09.004.
  36. [2] Schmidt, Frank L., and John E. Hunter. “The Validity and Utility of Selection Methods in Personnel Psychology: Practical and Theoretical Implications of 85 Years of Research Findings.” Psychological Bulletin, vol. 124, no. 2, 1998, pp. 262–74, doi:10.1037/0033-2909.124.2.262.
  37. [3] Huffcutt, Allen I., and Winfred Arthur. "Hunter and Hunter (1984) revisited: Interview validity for entry-level jobs." (1994): 184.
  38. [4] Schmidt, Frank L., and John Hunter. “General Mental Ability in the World of Work: Occupational Attainment and Job Performance.” Journal of Personality and Social Psychology, vol. 86, no. 1, 2004, pp. 162–73, doi:10.1037/0022-3514.86.1.162.
  39. [5] Schwartz, Joseph A., et al. “Intelligence and Criminal Behavior in a Total Birth Cohort: An Examination of Functional Form, Dimensions of Intelligence, and the Nature of Offending.” Intelligence, vol. 51, 2015, pp. 109–18, doi:10.1016/j.intell.2015.06.001.
  40. [6] Frisell, Thomas, et al. “Is the Association between General Cognitive Ability and Violent Crime Caused by Family-Level Confounders?” PLoS ONE, vol. 7, no. 7, 2012, p. e41783, doi:10.1371/journal.pone.0041783.
  41. [7] Levine, Stephen Z. “Elaboration on the Association between IQ and Parental SES with Subsequent Crime.” Personality and Individual Differences, vol. 50, no. 8, 2011, pp. 1233–37, doi:10.1016/j.paid.2011.02.016.
  42. [8] Stattin, Håkan, and Ingrid Klackenberg-Larsson. “Early Language and Intelligence Development and Their Relationship to Future Criminal Behavior.” Journal of Abnormal Psychology, vol. 102, no. 3, 1993, pp. 369–78, doi:10.1037/0021-843x.102.3.369.
  43. [9] Denissen, Jaap J. A., et al. “Antecedents and Consequences of Peer-Rated Intelligence.” European Journal of Personality, vol. 25, no. 2, 2010, pp. 108–19, doi:10.1002/per.799.
  44. [10] Bailey, Roger C., and Gwynn W. Mettetal. “PERCEIVED INTELLIGENCE IN MARRIED PARTNERS.” Social Behavior and Personality: An International Journal, vol. 5, no. 1, 1977, pp. 137–41, doi:10.2224/sbp.1977.5.1.137.
  45. [11] Paulhus, Delroy L., and Kathy L. Morgan. “Perceptions of Intelligence in Leaderless Groups: The Dynamic Effects of Shyness and Acquaintance.” Journal of Personality and Social Psychology, vol. 72, no. 3, 1997, pp. 581–91, doi:10.1037//0022-3514.72.3.581.
  46. [12] Bailey, Roger C., and Victoria Hatch. “Interpersonal Perceptions of Intelligence in Late Childhood and Early Adolescent Friendships.” The Journal of Genetic Psychology, vol. 135, no. 1, 1979, pp. 109–14, doi:10.1080/00221325.1979.10533422.
  47. [13] Chabris, C. F. "Cognitive and neurobiological mechanisms of the Law of General Intelligence. In MJ Roberts (Ed.), Integrating the mind: Domain specific versus domain general processes in higher cognition (pp. 449 (491)." (2007).
  48. [14] Wise, C. A., et al. “Comparative Nuclear and Mitochondrial Genome Diversity in Humans and Chimpanzees.” Molecular Biology and Evolution, vol. 14, no. 7, 1997, pp. 707–16, doi:10.1093/oxfordjournals.molbev.a025810.
  49. [15] Jorde, L. B., et al. “Microsatellite Diversity and the Demographic History of Modern Humans.” Proceedings of the National Academy of Sciences, vol. 94, no. 7, 1997, pp. 3100–03, doi:10.1073/pnas.94.7.3100.
  50. [16] Bowcock, A. M., et al. “High Resolution of Human Evolutionary Trees with Polymorphic Microsatellites.” Nature, vol. 368, no. 6470, 1994, pp. 455–57, doi:10.1038/368455a0.
  51. [17] Ebersberger, Ingo, et al. “Genomewide Comparison of DNA Sequences between Humans and Chimpanzees.” The American Journal of Human Genetics, vol. 70, no. 6, 2002, pp. 1490–97, doi:10.1086/340787.
  52. [18] Bouchard, Thomas J. “The Wilson Effect: The Increase in Heritability of IQ With Age.” Twin Research and Human Genetics, vol. 16, no. 5, 2013, pp. 923–30, doi:10.1017/thg.2013.54.
  53. [19] Haworth, C. M. A., et al. “The Heritability of General Cognitive Ability Increases Linearly from Childhood to Young Adulthood.” Molecular Psychiatry, vol. 15, no. 11, 2009, pp. 1112–20, doi:10.1038/mp.2009.55.
  54. [20] Bouchard, Thomas J., and Matt McGue. “Genetic and Environmental Influences on Human Psychological Differences.” Journal of Neurobiology, vol. 54, no. 1, 2002, pp. 4–45, doi:10.1002/neu.10160.
  55. [21] Must, Olev, et al. “The Secular Rise in IQs: In Estonia, the Flynn Effect Is Not a Jensen Effect.” Intelligence, vol. 31, no. 5, 2003, pp. 461–71, doi:10.1016/s0160-2896(03)00013-8.
  56. [22] Halpern, Carolyn Tucker, et al. “Smart Teens Don’t Have Sex (or Kiss Much Either).” Journal of Adolescent Health, vol. 26, no. 3, 2000, pp. 213–25, doi:10.1016/s1054-139x(99)00061-0.
  57. [23] Pietschnig, Jakob, and Martin Voracek. “One Century of Global IQ Gains.” Perspectives on Psychological Science, vol. 10, no. 3, 2015, pp. 282–306, doi:10.1177/1745691615577701.
  58. [24] Woodley of Menie, Michael A., and Heitor B. F. Fernandes. “The Secular Decline in General Intelligence from Decreasing Developmental Stability: Theoretical and Empirical Considerations.” Personality and Individual Differences, vol. 92, 2016, pp. 194–99, doi:10.1016/j.paid.2015.12.035.
  59. [25] Nijenhuis, Jan te, et al. “The Correlation between g Loadings and Heritability in Japan: A Meta-Analysis.” Intelligence, vol. 46, 2014, pp. 275–82, doi:10.1016/j.intell.2014.07.008.
  60. [26] Skirbekk, Vegard. “Fertility Trends by Social Status.” Demographic Research, vol. 18, 2008, pp. 145–80, doi:10.4054/demres.2008.18.5.
  61. [27] CLARK, GREGORY, and GILLIAN HAMILTON. “Survival of the Richest: The Malthusian Mechanism in Pre-Industrial England.” The Journal of Economic History, vol. 66, no. 03, 2006, pp. 707–36, doi:10.1017/s0022050706000301.
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