the reasons for the decline in IQ in the population

Many have triedreverse Flynn effect, that is, the reduction of IQ in the population; many hypotheses have been proposed and various scientific studies have dealt with them.

The Flynn effect and the Reverse Flynn effect

Advertisement The intelligence quotient (IQ) is a number that expresses the relationship between a person’s intellectual level, measured by specific tests, and that of the average of subjects belonging to the same sociocultural status and age group. IQ is considered as a measure of an individual’s intelligence or cognitive development.

From 1938 to about 1985, the IQ of the entire industrialized world had risen (Flynn J. 1987). The first to observe this fact was James Robet Flynn and the phenomenon then took its name Flynn Effect. From the early 2000s onwards, an inverse trend began to be observed, the IQ, over the years, rather than increasing the population, declining. This event got its name from reverse Flynn effect (Teasdale T., Owen D. 2005).

Many have attempted to provide an explanation as to the causes of this fact, many hypotheses have been proposed and various scientific studies have dealt with thereverse Flynn effect.

The causes of the reverse Flynn effect

2004 a study with the title The end of the Flynn effect ?: A study of secular trends and middle intelligence tests scores of Norwegian word characters over half a centurywhich has demonstrated the deterioration of IQ in the Norwegian population since the mid-1990s (Sundet JM., Barlug D., TorjussenTM. 2004).

The research was published in 2005 in Denmark A long-term rise and recent decline in intelligence test performance: The Flynn effect in the back. The authors report a decline in the IQ of the Danish population since the late 1990s. They hypothesize that a factor behind this phenomenon may be a decline in the number of children, between 16 and 18 years of age, gaining access to advanced school programs (Teasdale T., Owen D. 2005).

Advertisement In 2008, the study was published The decline of world IQ after which the decline in IQ in the population is associated with dysgenetic causes. The authors draw on earlier studies conducted in four economically developed countries. Based on the analysis of the data, they believe that it is possible that youreverse Flynn effect it will spread to developing countries and the whole world will enter a period of decline in genotypic and phenotypic intelligence (Lynn R., Harvey J. 2008).

In 2009, Flynn conducted research Requiem for Nutrition as a Cause of IQ Profit: Raven’s Profit in the UK 1938–2008 confirms the decline in IQ in the UK population since 2000. According to Flynn, the decline in IQ was not affected by diet.

The reverse Flynn effect and environmental factors

In 2018, Bratsberg B. and Roberter O. published the research The Flynn effect and its decline are both environmentally friendly. According to the two authors of the Ragnar Frisch Center for Economic Research at the University of Oslo, the causes ofreverse Flynn effect they are mainly found in environmental factors. The researchers actually made an analysis of the data on family trends and from the observation of the data, no consistent factors emerged, within families, associated with the decrease in IQ. For this reason, it is possible to exclude that the decline in IQ may be due to the number of members of the family unit, the type of family formation and the increase in immigration. Bratsberg and Roberter believe that youreverse Flynn effect is associated with schooling, excessive use of video games and the Internet, and a reduction in reading time.

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Bibliography

  • Bratsberg B., Roberger O (2018) The Flynn effect and its decline are both environmentally friendly. PNAS June 26, 2018 115 (26) 6674-6678
  • Fiore, F. (2016). IQ and Mental Age – Introduction to Psychology. State of mind
  • Flynn J. (1987) Massive IQ Profits in 14 Nations: What IQ Tests Really Measure. Psychological Bulletin 101 (2): 171-191
  • Flynn J. (2009) Requiem for nutrition as a cause of IQ gain: Raven’s gain in the UK 1938–2008. Science Direct Economics and Human Biology, Elsevier. 7 (1): 1-132
  • Lynn R., Harvey J. (2008) The Decline of the World’s IQ Science Direct, Intelligence, Elsevier 36 (2): 99-182
  • Sundet JM, Barlug D, Torjussen TM. (2004) The end of the Flynn effect ?: A study of secular trends and middle intelligence test scores of Norwegian forced laborers over half a century. Science Direct, Intelligence, Elsevier 32 (4): 321-430
  • Teasdale T., Owen D. (2005) Long-term rise and recent decline in intelligence test performance: The Flynn effect in the back. Science Direct, Intelligence, Elsevier. 39 (4): 689-850
  • Thomas W. Teasdale, David R. Owen (2008) Secular Decline and Cognitive Test Scores: A Decline of the Flynn Effect. Science Direct, Intelligence, Elsevie. 36: 121-126
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