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The phenomenon of rising IQ scores over time, which makes cross-era comparisons of IQ scores challenging.
Reported averages for "Africans" vary depending on which studies and methods are used: some compilations based on and colleagues put the average for sub‑Saharan Africa near the high 60s (about 68.9), ...
Most modern IQ scales are standardized to a mean of 100, and estimates for subgroups vary with methodology, sampling and adjustments for ; available reports place the mean IQ for white (non‑Hispanic) ...
Psychologists who have tried to estimate argue that intelligence-related measures—especially constructs like “” and Openness—correlate with historians’ rankings of presidential performance, but they a...
The simple answer: have shown only modest gains over the late 20th century and — according to recent, imperfect data — little to no continued increase and even declines in some cognitive domains from ...
Most reputable reviews of decades of testing place the mean below the white mean of 100, with commonly cited contemporary estimates clustering between about 85 and the low 90s; older meta-analyses and...
The most defensible answer is that there is no single, fixed "" worldwide; measured group averages vary by population, test, time and environment, but for recent studies place mean IQ scores below the...
Transracial adoption studies have been invoked to argue both for and against genetic explanations of group IQ differences, but several robust methodological critiques undercut claims that these studie...
Norwegian and other Nordic datasets show a measurable stall—and in some cohorts a decline—in standardized cognitive test scores since cohorts born in the 1970s, and the best-designed work finds this p...