From the WALL STREET JOURNAL:
Nearly a quarter of the changes often seen in a person’s intelligence level over the course of a lifetime may be due to genes, a proportion never before estimated, new research shows…
The new study, published in the journal Nature, offers one of the first estimates of how much genes and the environment contribute to fluctuations in a person’s intelligence between adolescence and old age. It found that genetic differences account for 24% of the variation….
Scientists elsewhere have determined that a person’s intelligence level as measured by an IQ test isn’t fixed at birth. Instead, a person’s IQ can rise or fall as the person ages. One recent brain-scanning study found that a teenager’s IQ can increase or decline by as many as 20 points in just a few years…
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