American IQ test scores have dropped during a recent 13-year period, according to a newly published study. That's a remarkable finding that runs counter to the well-established trend of increasing IQ scores throughout much of the 20th century.
y scores that were derived from multiple pieces of information were also lower among more recent samples of tested adults. The differences in scores were found regardless of participants’ age, education or gender.cautioned“It doesn’t mean their mental ability is lower or higher; it’s just a difference in scores that are favoring older or newer samples,” said Dworak, a research assistant professor of medical social sciences at Northwestern University Feinberg School of Medicine.
Possible explanations for the downward direction include a shift in educational practices and emphases, a biased sample of adults who responded to the online SAPA instrument, differences in motivation among people taking this test versus those who are tested for different reasons, and differences between this instrument and the standard IQ tests used in other research.
More research will be needed to explore the possible explanations for the phenomenon. Dworak and her colleagues are currently trying to examine a dataset containing 40 years of information to conduct a follow-up study.
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