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Studies: IQ

Version 7.1 by Ryan C on 2025/06/21 05:56

IQ

Study: Survey of Expert Opinion on Intelligence: Intelligence Research, Experts' Background, Controversial Issues, and the Media

Source: *Intelligence (Elsevier)*
Date of Publication: *2019*
Author(s): *Heiner Rindermann, David Becker, Thomas R. Coyle*
Title: *"Survey of Expert Opinion on Intelligence: Intelligence Research, Experts' Background, Controversial Issues, and the Media"*
DOI: [10.1016/j.intell.2019.101406](https://doi.org/10.1016/j.intell.2019.101406)
Subject Matter: *Psychology, Intelligence Research, Expert Analysis*

πŸ“Š Key Statistics
  1. General Observations:
       - Survey of 102 experts on intelligence research and public discourse.
       - Evaluated experts' backgrounds, political affiliations, and views on controversial topics in intelligence research.

2. Subgroup Analysis:
   - 90% of experts were from Western countries, and 83% were male.
   - Political spectrum ranged from 54% left-liberal, 24% conservative, with significant ideological influences on views.

3. Other Significant Data Points:
   - Experts rated media coverage of intelligence research as poor (avg. 3.1 on a 9-point scale).
   - 50% of experts attributed US Black-White IQ differences to genetic factors, 50% to environmental factors.

πŸ”¬ Findings
  1. Primary Observations:
       - Experts overwhelmingly support the g-factor theory of intelligence.
       - Heritability of intelligence was widely accepted, though views differed on race and group differences.

2. Subgroup Trends:
   - Left-leaning experts were more likely to reject genetic explanations for group IQ differences.
   - Right-leaning experts tended to favor a stronger role for genetic factors in intelligence disparities.

3. Specific Case Analysis:
   - The study compared media coverage of intelligence research with expert opinions.
   - Found a disconnect between journalists and intelligence researchers, especially regarding politically sensitive issues.

πŸ“ Critique & Observations
  1. Strengths of the Study:
       - Largest expert survey on intelligence research to date.
       - Provides insight into how political orientation influences scientific perspectives.

2. Limitations of the Study:
   - Sample primarily from Western countries, limiting global perspectives.
   - Self-selection bias may skew responses toward those more willing to engage with controversial topics.

3. Suggestions for Improvement:
   - Future studies should include a broader range of global experts.
   - Additional research needed on media biases and misrepresentation of intelligence research.

πŸ“Œ Relevance to Subproject

- Provides insight into expert consensus and division on intelligence research.
- Highlights the role of media bias in shaping public perception of intelligence science.
- Useful for understanding the intersection of science, politics, and public discourse on intelligence research.

πŸ” Suggestions for Further Exploration
  1. Examine cross-national differences in expert opinions on intelligence.
    2. Investigate how media bias impacts public understanding of intelligence research.
    3. Conduct follow-up studies with a more diverse expert pool to test findings.
Study: A Review of Intelligence GWAS Hits: Their Relationship to Country IQ and the Issue of Spatial Autocorrelation

Source: *Intelligence (Elsevier)*
Date of Publication: *2015*
Author(s): *Davide Piffer*
Title: *"A Review of Intelligence GWAS Hits: Their Relationship to Country IQ and the Issue of Spatial Autocorrelation"*
DOI: [10.1016/j.intell.2015.08.008](https://doi.org/10.1016/j.intell.2015.08.008)
Subject Matter: *Genetics, Intelligence, GWAS, Population Differences*

πŸ“Š Key Statistics
  1. General Observations:
       - Study analyzed genome-wide association studies (GWAS) hits linked to intelligence.
       - Found a strong correlation (r = .91) between polygenic intelligence scores and national IQ levels.

2. Subgroup Analysis:
   - Factor analysis of 9 intelligence-associated alleles revealed a metagene correlated with country IQ (r = .86).
   - Allele frequencies varied significantly by continent, aligning with observed population differences in cognitive ability.

3. Other Significant Data Points:
   - GWAS intelligence SNPs predicted IQ levels more strongly than random genetic markers.
   - Genetic differentiation (Fst values) showed that selection pressure, rather than drift, influenced intelligence-related allele distributions.

πŸ”¬ Findings
  1. Primary Observations:
       - Intelligence-associated SNP frequencies correlate highly with national IQ levels.
       - Genetic selection for intelligence appears stronger than selection for height-related genes.

2. Subgroup Trends:
   - East Asian populations exhibited the highest frequencies of intelligence-associated alleles.
   - African populations showed lower frequencies compared to European and East Asian populations.

3. Specific Case Analysis:
   - Polygenic scores using intelligence-related alleles significantly outperformed random SNPs in predicting IQ.
   - Selection pressures may explain differences in global intelligence distribution beyond genetic drift effects.

πŸ“ Critique & Observations
  1. Strengths of the Study:
       - Comprehensive genetic analysis of intelligence-linked SNPs.
       - Uses multiple statistical methods (factor analysis, Fst analysis) to confirm results.

2. Limitations of the Study:
   - Correlation does not imply causation; factors beyond genetics influence intelligence.
   - Limited number of GWAS-identified intelligence allelesβ€”future studies may identify more.

3. Suggestions for Improvement:
   - Larger cross-population GWAS studies needed to validate findings.
   - Investigate non-genetic contributors to IQ variance in addition to genetic factors.

πŸ“Œ Relevance to Subproject

- Supports research on genetic influences on intelligence at a population level.
- Aligns with broader discussions on cognitive genetics and natural selection effects.
- Provides a quantitative framework for analyzing polygenic selection in intelligence studies.

πŸ” Suggestions for Further Exploration
  1. Conduct expanded GWAS studies including diverse populations.
    2. Investigate gene-environment interactions influencing intelligence.
    3. Explore historical selection pressures shaping intelligence-related alleles.
Study: Genetic Structure, Self-Identified Race/Ethnicity, and Confounding in Case-Control Association Studies

Source: *Genetic Epidemiology*  
Date of Publication: *2001*  
Author(s): *Neil Risch, Esteban Burchard, Elisa Ziv, Hua Tang*  
Title: *"Genetic Structure, Self-Identified Race/Ethnicity, and Confounding in Case-Control Association Studies"*  
DOI: [10.1038/ng1199-355](https://doi.org/10.1038/ng1199-355)  
Subject Matter: *Population Genetics, Biomedical Research, Race & Ancestry*

πŸ“Š Key Statistics
  1. General Observations:
       - Sample: 3,636 individuals from White, African-American, East Asian, and Hispanic groups.
       - Genotyped for 326 microsatellite markers.

2. Subgroup Analysis:
   - Self-identified race matched genetic clusters 99.86% of the time.
   - Each group formed distinct, non-overlapping clusters in genetic space.

3. Other Significant Data Points:
   - Genetic structure correlated strongly with continental ancestry, not geography of residence.
   - Demonstrated minimal overlap between populations, affirming biological distinctiveness of racial groupings.

πŸ”¬ Findings
  1. Primary Observations:
       - Self-identified race is a valid proxy for genetic ancestry in medical and population studies.
       - Racial classification is not merely β€œsocially constructed,” but reflects deep ancestral population structure.

2. Subgroup Trends:
   - East Asians, Africans, and Europeans formed clear, separable genetic clusters.
   - Hispanics showed admixture, but still clustered distinguishably.

3. Specific Case Analysis:
   - The paper challenged the PC dogma that race is biologically meaningless.
   - Warned that ignoring race in genetic studies can introduce confounding, especially in disease association research.

πŸ“ Critique & Observations
  1. Strengths of the Study:
       - Robust dataset across multiple racial/ethnic groups.
       - Clear empirical demonstration of the biological reality of race.

2. Limitations of the Study:
   - Did not account for intra-population stratification or recent admixture in fine detail.
   - Based on microsatellite markers β€” less resolution than full-genome sequencing.

3. Suggestions for Improvement:
   - Update with modern SNP or WGS data.
   - Include more populations (e.g., Middle Easterners, South Asians) for global structure.

πŸ“Œ Relevance to Subproject

- Provides foundational genetic evidence supporting the coherence of racial classifications.
- Useful in refuting the claim that race is merely a sociological artifact.
- Directly applicable to the race realism and genetic confounding discussion in medical ethics and social sciences.

πŸ” Suggestions for Further Exploration
  1. Analyze how racial identity correlates with disease risk and treatment outcomes.  
    2. Compare modern SNP datasets to validate or refine the 2001 conclusions.  
    3. Investigate how DEI-driven research suppresses or distorts findings on genetic ancestry.

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