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-{{expandable summary=" |
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-Study: Is there a Dysgenic Secular Trend Towards Slowing Simple Reaction Time?"}} |
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-**Source:** *Intelligence (Elsevier)* |
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-**Date of Publication:** *2014* |
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-**Author(s):** *Michael A. Woodley, Jan te Nijenhuis, Raegan Murphy* |
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-**Title:** *"Is there a Dysgenic Secular Trend Towards Slowing Simple Reaction Time?"* |
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-**DOI:** [10.1016/j.intell.2014.05.012](https://doi.org/10.1016/j.intell.2014.05.012) |
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-**Subject Matter:** *Cognitive Decline, Intelligence, Dysgenics* |
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-{{expandable summary="📊 Key Statistics"}} |
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-1. **General Observations:** |
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- - The study examines reaction time data from **13 age-matched studies** spanning **1884–2004**. |
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- - Results suggest an estimated **decline of 13.35 IQ points** over this period. |
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-2. **Subgroup Analysis:** |
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- - The study found **slower reaction times in modern populations** compared to Victorian-era individuals. |
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- - Data from **Western countries (US, UK, Canada, Australia, Finland)** were analyzed. |
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-3. **Other Significant Data Points:** |
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- - The estimated **dysgenic rate is 1.21 IQ points lost per decade**. |
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- - Meta-regression analysis confirmed a **steady secular trend in slowing reaction time**. |
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-{{expandable summary="🔬 Findings"}} |
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-1. **Primary Observations:** |
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- - Supports the hypothesis of **intelligence decline due to genetic and environmental factors**. |
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- - Reaction time, a **biomarker for cognitive ability**, has slowed significantly over time. |
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-2. **Subgroup Trends:** |
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- - A stronger **correlation between slower reaction time and lower general intelligence (g)**. |
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- - Flynn effect (IQ gains) does not contradict this finding, as reaction time is a **biological, not environmental, measure**. |
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-3. **Specific Case Analysis:** |
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- - Cross-national comparisons indicate a **global trend in slower reaction times**. |
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- - Factors like **modern neurotoxin exposure** and **reduced selective pressure for intelligence** may contribute. |
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-{{expandable summary="📝 Critique & Observations"}} |
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-1. **Strengths of the Study:** |
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- - **Comprehensive meta-analysis** covering over a century of reaction time data. |
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- - **Robust statistical corrections** for measurement variance between historical and modern studies. |
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-2. **Limitations of the Study:** |
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- - Some historical data sources **lack methodological consistency**. |
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- - **Reaction time measurements vary by study**, requiring adjustments for equipment differences. |
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-3. **Suggestions for Improvement:** |
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- - Future studies should **replicate results with more modern datasets**. |
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- - Investigate **alternative cognitive biomarkers** for intelligence over time. |
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-{{expandable summary="📌 Relevance to Subproject"}} |
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-- Provides evidence for **long-term intelligence trends**, contributing to research on **cognitive evolution**. |
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-- Aligns with broader discussions on **dysgenics, neurophysiology, and cognitive load**. |
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-- Supports the argument that **modern societies may be experiencing intelligence decline**. |
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-{{expandable summary="🔍 Suggestions for Further Exploration"}} |
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-1. Investigate **genetic markers associated with reaction time** and intelligence decline. |
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-2. Examine **regional variations in reaction time trends**. |
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-3. Explore **cognitive resilience factors that counteract the decline**. |
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-{{expandable summary="📄 Download Full Study"}} |
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-[[Download Full Study>>attach:10.1016_j.intell.2014.05.012.pdf]] |
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-{{/expandable}} |
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-{{/expandable}} |