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Related Concept Videos

Biological Influences on Intelligence01:30

Biological Influences on Intelligence

Intelligence is often thought to be linked to brain size, but the relationship is more complex than that. While brain size does correlate modestly with some abilities, like verbal skills, the connection is weaker for others, such as spatial reasoning. Other factors, like brain structure, also play crucial roles. For instance, despite Einstein's smaller-than-average brain, his parietal cortex, which is involved in spatial reasoning, was 15% wider, suggesting that neural density might matter more...
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Heritability is a statistical concept that measures the degree to which genetic differences among individuals contribute to trait variations within a population. It is a fundamental idea in genetics, often prone to misinterpretation. Heritability is expressed as a percentage, reflecting the proportion of variation in a specific trait across a population that can be linked to genetic differences. However, it's important to understand that heritability does not determine how "genetic" a trait is,...
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When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...
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Mapping Alzheimer's Disease Variants to Their Target Genes Using Computational Analysis of Chromatin Configuration
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Genome-wide association studies establish that human intelligence is highly heritable and polygenic.

G Davies1, A Tenesa, A Payton

  • 1Department of Psychology, University of Edinburgh, Edinburgh, Scotland, UK.

Molecular Psychiatry
|August 10, 2011
PubMed
Summary

Genetic factors significantly influence general intelligence, a key human trait. This genome-wide study estimates substantial heritability for crystallized and fluid intelligence, confirming genetic contributions to cognitive abilities.

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Area of Science:

  • Behavioral genetics
  • Human quantitative genetics

Background:

  • General intelligence is a crucial human trait influencing diverse cognitive abilities and life outcomes.
  • Previous twin and family studies suggested high heritability, but this remained debated.
  • Understanding the genetic basis of intelligence is vital for explaining individual differences.

Purpose of the Study:

  • To investigate the heritability of general intelligence using genome-wide single nucleotide polymorphism (SNP) data.
  • To estimate the proportion of variance in crystallized and fluid intelligence attributable to common genetic variants.
  • To explore the relationship between chromosome length and genetic variation in intelligence.

Main Methods:

  • Genome-wide analysis of 549,692 SNPs in 3511 unrelated adults with detailed cognitive phenotypes.
  • Estimation of variance explained by common SNPs using linkage disequilibrium.
  • Prediction of cognitive phenotypes in an independent sample using SNP data.

Main Results:

  • Estimated that 40% of variation in crystallized intelligence and 51% in fluid intelligence is explained by common SNPs.
  • These estimates represent lower bounds for narrow-sense heritability.
  • Genetic variation was partitioned by chromosome, with longer chromosomes explaining more variance.
  • SNP data predicted approximately 1% of the variance in cognitive phenotypes in an independent sample.

Conclusions:

  • Unequivocally confirms substantial genetic variation underlies individual differences in human intelligence.
  • Findings are consistent with numerous genes of small effect contributing to additive genetic influences.
  • Provides robust evidence for the genetic architecture of general intelligence.