6 min readframeworks
Fluid vs. Crystallized Intelligence
The two engines behind your IQ: raw in-the-moment reasoning (Gf) and accumulated knowledge (Gc), how they diverge with age, feed each other, and which one you can actually train.
Blog — #cognitive-ability
Original research, methodology deep-dives, and comparison guides for personality assessments.
- 7 min readresearch
Can You Increase Your IQ?
What the evidence supports: heritability vs. neuroplasticity, what raises cognitive performance (learning, exercise, schooling) and why brain-game gains rarely transfer—plus the Flynn effect.
- 6 min readresearch
Average IQ by Age
Why your score is always compared to your peers. Age-norming explained, the lifespan trajectory of fluid vs. crystallized ability, and why midlife often trades speed for depth.
- 7 min readframeworks
The g Factor Explained: The One Thing Every Cognitive Test Has in Common
The most replicated finding in psychology. Spearman's g, the positive manifold, neural efficiency, factor analysis, and why your Full Scale IQ is essentially an estimate of g.
- 6 min readframeworks
What IQ Tests Actually Measure
What IQ scores sample: general ability (g), core subtests, prediction limits, fairness & Flynn nuances, misconceptions, constructive interpretation—not rank.