IQ has risen across generations worldwide, and the effect must be environmental since genetic mutation could not act that fast, amounting to about 15 IQ points per generation on fluid tests.
Evidence
Flynn Effect - an overview (ScienceDirect Topics)
Categorization
- corroborated: 3 independent passages support this claim
- XREF: connects to: Intelligence is malleable and shaped by environment, not fixed by heredity ā Harriet A. Washington, A Terrible Thing to Waste, 54; Population IQ scores have risen rapidly over decades, refuting fixed-IQ claims ā Harriet A. Washington, A Terrible Thing to Waste, 124; Policies and interventions can raise a nationās average IQ (+14 more)
Related
- Population IQ scores have risen rapidly over decades, refuting fixed-IQ claims (similarity 0.89)
- The generational rise in IQ scores is attributed to environmental factors like improved nutrition, education, and reduced toxin exposure. (similarity 0.89)
- Large positive and negative trends in cohort IQ operate within as well as across families, implying at most a minor role for genes, with environment as the main driver. (similarity 0.88)
- Targeted interventions can raise a nationās average intelligence level (similarity 0.84)
- The secular trend in growth is almost entirely due to environmental factors since genetic changes in a whole population take far longer than the observed time interval. (similarity 0.83)
- With heritability well below 1.00, IQ must be subject to substantial environmental influences, though genetic influence increases with age while shared family environment effects shrink by lateā¦ (similarity 0.82)
- High heritability of individual differences and large environmental effects on population-level IQ are mathematically compatible under a reciprocal gene-environment coupling model (Dickens & Flynn). (similarity 0.81)
- Intelligence is malleable and shaped by environment, not fixed by heredity (similarity 0.80)
- IQ predicts job performance, academic achievement, and mortality better than any known psychological factor (similarity 0.80)
- With heritability well below 1.00, IQ must be subject to substantial environmental influences, though genetic influence increases with age while shared family environment effects shrink by late adolescence. (similarity 0.80)
- Genetic causation of a trait does not imply the trait is unchangeable (similarity 0.79)
- Disease-reduction interventions like vaccination and clean water could raise national IQ scores (similarity 0.79)
- Policies and interventions can raise a nationās average IQ (similarity 0.78)