... |
... |
@@ -1,5 +1,74 @@ |
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* |