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Cognitive epidemiology is a field of research that examines the associations between intelligence test scores (IQ scores or extracted g-factors) and health, more specifically morbidity (mental and physical) and mortality.
Evidence shows that education and intelligence have a complex interaction, and this is demonstrated in a longitudinal study by Richards and Sacker. [9] They collected data from the British 1946 birth cohort and investigated how childhood intelligence was predictive of other outcomes later in life including educational attainment and mental ability at 53 years old (using the National Adult ...
A Northwestern University study shows a decline in three key intelligence testing categories—a tangible example of what is called the Reverse Flynn Effect. Leading up to the 1990s, IQ scores ...
Since mother's IQ was predictive of whether a child was breastfed, the study concluded that "breast feeding [itself] has little or no effect on intelligence in children." Instead, it was the mother's IQ that had a significant correlation with the IQ of her offspring, whether the offspring was breastfed or was not breastfed.
They also reported that the magnitude of the effect was different for different types of intelligence ("0.41, 0.30, 0.28, and 0.21 IQ points annually for fluid, spatial, full-scale, and crystallized IQ test performance, respectively"), and that the effect was stronger for adults than for children.
The manual includes equations for converting NART scores to predicted IQ scores on the Wechsler Adult Intelligence Scale. The NART is widely used in research settings because a measure of premorbid intelligence is rarely available. However, the Lothian Birth Cohort Study has such data. Researchers from this study demonstrated that the ...
Cubes and a target pattern used in the Wechsler Adult Intelligence Scale test. A block design test is a subtest on many IQ test batteries used as part of assessment of human intelligence. It is thought to tap spatial visualization ability and motor skill. The test-taker uses hand movements to rearrange blocks that have various color patterns on ...
IQ tests had lower negative correlations with certain socially undesirable outcomes such as that children with high IQ were less likely to engage in juvenile crime. One example being a study finding a correlation of −0.19 (−0.17 with social class controlled for) between IQ scores and number of juvenile offenses in a large Danish sample.