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The Flynn effect is the substantial and long-sustained increase in both fluid and crystallized intelligence test scores that were measured in many parts of the world over the 20th century, named after researcher James Flynn (1934–2020).
The Bell Curve: Intelligence and Class Structure in American Life is a 1994 book by the psychologist Richard J. Herrnstein and the political scientist Charles Murray in which the authors argue that human intelligence is substantially influenced by both inherited and environmental factors and that it is a better predictor of many personal outcomes, including financial income, job performance ...
The 'Flynn effect' — a term coined after researcher James R. Flynn — refers to the substantial rise in raw IQ test scores observed in many parts of the world during the 20th century. In the United States, the increase was continuous and approximately linear from the earliest years of testing to about 1998 when the gains stopped and some ...
A few other hypotheses have been put forth to try and explain the reverse Flynn Effect, such as falling nutritional standards, the worsening of school systems, social media, increased air ...
On the basis of sound methods, the average IQ remains close to 80. Although this mean IQ is clearly lower than 100, we view it as unsurprising in light of the potential of the Flynn effect in Africa (Wicherts, Borsboom, & Dolan, 2010) and common psychometric problems associated with the use of western IQ tests among Africans." [14]
The authors argue that "From an energetics standpoint, a developing human will have difficulty building a brain and fighting off infectious diseases at the same time, as both are very metabolically costly tasks" and that "the Flynn effect may be caused in part by the decrease in the intensity of infectious diseases as nations develop." [22]
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