Module 29
Flynn Effect Awareness Sheet
How IQ scores shift over time and what modern tests actually measure
How to Use This
How to Use This: Review this sheet before or after your child is IQ tested. It will help you understand what the score means, which test was used, and why scores are not fixed or definitive. 'Fluid reasoning' refers to the ability to solve novel problems without relying on prior knowledge. 'Re-normed' means the test's scoring scale has been updated to reflect current population averages.
What Is It
IQ scores have risen ~3 points per decade since testing began in the early 1900s
Named After
James Flynn, NZ political scientist who documented the trend in 1984
IQ Score Trends by Decade
| Decade | Avg IQ (Re-Normed) | Trend | Likely Drivers |
|---|---|---|---|
| 1930s | ~80 (by modern norms) | Baseline | Limited education, nutrition deficits |
| 1950s | ~85-90 | Rising | Better nutrition, expanded schooling |
| 1970s | ~92-95 | Rising | Reduced lead exposure, more cognitive demands |
| 1990s | ~98-100 | Rising | Technology, information access, smaller families |
| 2010s | 100 (normed) | Flat/declining | Norms reset; some countries show decline |
| 2020s | ~97-100 (est.) | Slight decline | Screen time, reduced play, sleep deficits? |
If your child is tested with an older version of a test (norms from 5+ years ago), their score may be artificially inflated by 2-5 points. Always ask which norm year the test uses.
Modern IQ Test Comparison
| Test | Age Range | What It Measures | Duration |
|---|---|---|---|
| WISC-V | 6-16 years | Verbal comprehension, visual-spatial, fluid reasoning, working memory, processing speed | 60-90 min |
| WPPSI-IV | 2:6-7:7 years | Same domains adapted for younger children | 30-60 min |
| Stanford-Binet 5 | 2-85+ years | Fluid reasoning, knowledge, quantitative, visual-spatial, working memory | 45-75 min |
| KABC-II | 3-18 years | Sequential processing, simultaneous, planning, learning, knowledge | 30-75 min |
| DAS-II | 2:6-17:11 years | Verbal, nonverbal reasoning, spatial, working memory, processing speed | 45-65 min |
| CogAT | 5-18 years | Verbal, quantitative, nonverbal reasoning (group-administered) | 30-60 min |
Testing Limitations
IQ tests measure a snapshot, not a ceiling. A child's score can shift 10-15 points between testing sessions due to sleep, anxiety, rapport with the examiner, and time of day. Never treat a single score as a permanent label.
Next Steps
Next Steps: If your child has been tested, ask the evaluator which norm year the test uses and whether a newer version is available. Use the Intelligence-Building Daily Habits Checklist to focus on the modifiable factors that support cognitive growth.
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