
Historical Variability In Heritable General Intelligence
Description
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If this improvement in intelligence is real we should all be much, much brighter than the Victorians. However, the researchers of this ground-breaking study find the reverse to be true- the Victorians were cleverer than us! IQ tests may be effective at picking out the brightest, but they are not reliable benchmarks of performance over more than a century.
Historical Variance records the exploration of the Flyyn effect hypothesis, which included the use of high-quality instruments to measure simple reaction times (a recognised predictor of intelligence) in a meta-analytic study.
The conclusions are very sobering: far from speeding up, we are slowing down. A decline in general intelligence (a loss equivalent to about 14 IQ points) since Victorian times may have resulted from the presence of dysgenic fertility. These findings, as detailed in Historical Variance, strongly indicate that the Victorians were substantially cleverer than we are today.
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Content
- Cover
- Title
- Copyright
- Contents
- Summary
- 1. Introduction
- 1.1 Dysgenesis and Eugenesis Redefined
- 1.2 Differential Fertility by IQ
- 1.3 Genotypic IQ, Eminence, and Significant Innovations
- 1.4 Convergent Evidence: Relations among Dysgenic fertility, Flynn Effects and General vs. Specific Factors of Intelligence
- 1.5 Testable Predictions
- 2. Methods
- 2.1 Measures
- 2.2 Statistical Analysis
- 3. Results
- 3.1 Univariate Analyses: Growth Curve Models
- 3.2 Multivariate Analyses: Structural Equation Models
- 4. Discussion
- 4.1 Limitations of the Study
- 4.2 Objections: Alternative Models of Declining Rates of Innovation
- 4.3 Objections: Genetic Arguments
- 4.4 Evolutionary Considerations
- 4.5 The Broader Evolutionary Ecological Context
- 5. Conclusions
- Appendix A
- Appendix B
- Glossary of new terms
- References
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