>>724831245
The reversal — often called the negative Flynn effect — likely comes from multiple overlapping factors rather than a single cause. Key explanations include:
1. Education plateau – Schooling quality and length have stabilized in developed countries, so the cognitive gains from mass education have maxed out.
2. Digital distraction – More screen time and less deep reading or problem-solving may reduce sustained attention and abstract reasoning practice.
3. Environmental changes – Less lead exposure once boosted IQ; now that benefit’s gone. Meanwhile, new factors (like pollution or poor sleep) may offset gains.
4. Demographic shifts – Lower birth rates among higher-educated populations can slightly lower the average IQ.
5. Test fatigue or cultural change – People may not engage with tests as seriously as in the past, and IQ tests may no longer reflect the skills modern life values most.
In short, the cognitive environment that once drove IQ upward has leveled off — and in some areas, started pushing in the opposite direction.