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1 1  = IQ =
2 2  
3 +{{expandable summary="
4 +
5 +Study: Is there a Dysgenic Secular Trend Towards Slowing Simple Reaction Time?"}}
6 +**Source:** *Intelligence (Elsevier)*
7 +**Date of Publication:** *2014*
8 +**Author(s):** *Michael A. Woodley, Jan te Nijenhuis, Raegan Murphy*
9 +**Title:** *"Is there a Dysgenic Secular Trend Towards Slowing Simple Reaction Time?"*
10 +**DOI:** [10.1016/j.intell.2014.05.012](https://doi.org/10.1016/j.intell.2014.05.012)
11 +**Subject Matter:** *Cognitive Decline, Intelligence, Dysgenics*
12 +
13 +{{expandable summary="📊 Key Statistics"}}
14 +1. **General Observations:**
15 + - The study examines reaction time data from **13 age-matched studies** spanning **1884–2004**.
16 + - Results suggest an estimated **decline of 13.35 IQ points** over this period.
17 +
18 +2. **Subgroup Analysis:**
19 + - The study found **slower reaction times in modern populations** compared to Victorian-era individuals.
20 + - Data from **Western countries (US, UK, Canada, Australia, Finland)** were analyzed.
21 +
22 +3. **Other Significant Data Points:**
23 + - The estimated **dysgenic rate is 1.21 IQ points lost per decade**.
24 + - Meta-regression analysis confirmed a **steady secular trend in slowing reaction time**.
25 +{{/expandable}}
26 +
27 +{{expandable summary="🔬 Findings"}}
28 +1. **Primary Observations:**
29 + - Supports the hypothesis of **intelligence decline due to genetic and environmental factors**.
30 + - Reaction time, a **biomarker for cognitive ability**, has slowed significantly over time.
31 +
32 +2. **Subgroup Trends:**
33 + - A stronger **correlation between slower reaction time and lower general intelligence (g)**.
34 + - Flynn effect (IQ gains) does not contradict this finding, as reaction time is a **biological, not environmental, measure**.
35 +
36 +3. **Specific Case Analysis:**
37 + - Cross-national comparisons indicate a **global trend in slower reaction times**.
38 + - Factors like **modern neurotoxin exposure** and **reduced selective pressure for intelligence** may contribute.
39 +{{/expandable}}
40 +
41 +{{expandable summary="📝 Critique & Observations"}}
42 +1. **Strengths of the Study:**
43 + - **Comprehensive meta-analysis** covering over a century of reaction time data.
44 + - **Robust statistical corrections** for measurement variance between historical and modern studies.
45 +
46 +2. **Limitations of the Study:**
47 + - Some historical data sources **lack methodological consistency**.
48 + - **Reaction time measurements vary by study**, requiring adjustments for equipment differences.
49 +
50 +3. **Suggestions for Improvement:**
51 + - Future studies should **replicate results with more modern datasets**.
52 + - Investigate **alternative cognitive biomarkers** for intelligence over time.
53 +{{/expandable}}
54 +
55 +{{expandable summary="📌 Relevance to Subproject"}}
56 +- Provides evidence for **long-term intelligence trends**, contributing to research on **cognitive evolution**.
57 +- Aligns with broader discussions on **dysgenics, neurophysiology, and cognitive load**.
58 +- Supports the argument that **modern societies may be experiencing intelligence decline**.
59 +{{/expandable}}
60 +
61 +{{expandable summary="🔍 Suggestions for Further Exploration"}}
62 +1. Investigate **genetic markers associated with reaction time** and intelligence decline.
63 +2. Examine **regional variations in reaction time trends**.
64 +3. Explore **cognitive resilience factors that counteract the decline**.
65 +{{/expandable}}
66 +
67 +{{expandable summary="📄 Download Full Study"}}
68 +[[Download Full Study>>attach:10.1016_j.intell.2014.05.012.pdf]]
69 +{{/expandable}}
70 +{{/expandable}}
71 +
3 3  {{expandable summary="Study: Survey of Expert Opinion on Intelligence: Intelligence Research, Experts' Background, Controversial Issues, and the Media"}}
4 4  **Source:** *Intelligence (Elsevier)*
5 5  **Date of Publication:** *2019*