15/02/2026
And way more mental health issues.
Gen Z is the first generation to have a lower IQ than their parents. For decades, researchers observed what’s known as the “Flynn Effect,” where average IQ scores steadily increased across generations. However, in several developed countries such as the United States, the United Kingdom, Norway, Finland, and Denmark, those gains have slowed, plateaued, or slightly reversed in recent years.
To be clear, this does not automatically mean that Gen Z is inherently less intelligent. It means that performance on certain standardized IQ tests has changed.
Typically, IQ scores are influenced by many environmental factors, including education quality, nutrition, exposure to environmental toxins, cultural shifts, and even changes in how tests are designed or administered.
Some researchers speculate that increased screen time, short-form content consumption, reduced deep reading, and fragmented attention from heavy social media use may influence certain cognitive skills.
Dr. Jared Cooney Horvath, who recently testified before Congress, said about Gen Z:
“They’re the first generation in modern history to score lower on standardized academic tests than the one before it.”
“And to make matters worse, most of these young people are overconfident about how smart they are. The smarter people think they are, the dumber they actually are."
“More than half of the time a teenager is awake, half of it is spent staring at a screen, humans are biologically programmed to learn from other humans and from deep study, not flipping through screens for bullet point summaries.”
All in all the social media and smartphone use hypothesis points to much of the research that has been coming out for years. That people's brains, especially young people, are being deeply affected by over use.