Studiu pe 730.000 de persoane: IQ-ul este în declin, iar genele nu sunt cauza

A study involving nearly 730,000 Norwegian recruits reveals a decline in IQ scores after 1975, contradicting genetic explanations. Researchers found that the decrease, about seven points per generation, occurred within families, not just between them. This challenges the older theory that lower IQ individuals have more children. An American study shows a more complex picture, with verbal reasoning scores dropping while spatial skills improved. Researchers attribute these changes to environmental factors rather than genetics.