Researchers at Northwestern say intelligence quotient [IQ] scores are declining globally and that America is among the nations with a statistically significant decline in average IQ.
The researchers say that when comparing IQ test results from 2006 to 2018. They specifically looked at four aspects of IQ tests; matrix reasoning, letter and number series, verbal reasoning, and three-dimensional rotation. They found an increase in three-dimensional rotation from 2011 to 2018, which involves the test subject’s ability to visualize a three-dimensional object.
They found matrix reasoning, letter and number series, and verbal reasoning declined. Matric reasoning is thinking abstractly and solving problems independently of prior knowledge or experience. Number series questions test the ability to analyze and solve problems based on numerical patterns. This part of the test is especially relevant to predicting the test subject’s ability to thrive in engineering and finance. Verbal reasoning tests reading comprehension and the ability to draw conclusions from written information.
The researchers compared scores by age, education, and gender. Noticeably absent is any comparison along racial lines. The most obvious reason for a declining average IQ in the USA would be mass immigration from countries with lower average IQs.
Note that Flynn effect refers to an observed increase in IQ scores that went on from the 1930s to the 1990s.
In 2002, two internationally acclaimed researchers, Richard Lynn and Tatu Vanhanen, published the ground breaking book IQ and the Wealth of Nations.
Since IQ is heavily dependent on genetics, a decline in average IQ will also be noticed if people with lower IQs have larger numbers of children. America’s welfare state could be exacerbating a decline in average IQs.