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The social psychologist warns that 50 years of educational progress has been erased and global cognitive decline is accelerating—but says we can still reverse course.
In a stark warning delivered to a packed auditorium at the Massachusetts Institute of Technology, social psychologist Jonathan Haidt argued that smartphones and social media are doing far more than making young people anxious—they are systematically dismantling humanity's ability to think, focus, and maintain functional democratic societies.
Speaking at the latest MIT Compton Lecture, the New York University professor presented data showing dramatic global declines in cognition, attention spans, and civic stability—all correlating with the mass adoption of internet-connected devices over the past decade. And with artificial intelligence on the rise, Haidt warned, the situation is about to get much worse.
"Around the world, people are getting diminished," Haidt told the audience of over 400 students, faculty, and researchers at MIT's Huntington Hall. "Less intelligent, less happy, less competent. And it's happening very fast."
The Attention Crisis Nobody Saw Coming
While Haidt's previous work—including his bestseller "The Anxious Generation"—focused heavily on teen mental health, his MIT lecture revealed a more frightening realization: anxiety and depression, as severe as they are, may only be symptoms of a deeper problem.
"There's something bigger," Haidt explained. "It is the destruction of the human capacity to pay attention. Because this is affecting most people, including most adults. And if you imagine humanity with 10 to 50 percent of its attentional ability sucked out of it, there's not much left. We're not very capable of doing things if we can't focus or stay on a task for more than 30 seconds."
The timing of his lecture provided an unintentional but perfect demonstration. Just as Haidt mentioned his own affection for his iPhone—"I love tech, I love modernity, we're all dependent on it, I love my iPhone"—an audience member's cellphone began ringing loudly, drawing waves of laughter from the crowd.
"I did not plant that," Haidt said, smiling. "That was a truly spontaneous demonstration of what I'm talking about."
Education's Lost Half-Century
Perhaps the most alarming data Haidt presented concerned American education. Since schools began placing internet-connected devices in classrooms, student performance has plummeted across nearly all metrics—except for the top quartile of students, who have largely maintained their trajectory.
"The biggest, the most costly mistake we've ever made in the history of American education was to put computers and high tech on people's desks," Haidt declared.
The consequences extend far beyond test scores. College professors report students who can no longer read entire books. Film students struggle to sit through full-length movies. The ability to sustain attention on any single task—the foundation of all complex learning and achievement—has been systematically eroded.
"Fifty years of progress in education, 50 years of progress, up in smoke, gone," Haidt said. "We're back to where we were 50 years ago. That's pretty big, that's pretty serious."
Beyond Individual Harm: The Civic Collapse
Haidt expanded his critique beyond personal cognition to examine broader societal effects. His research shows a global reduction in democratic stability since the 2010s, which he attributes directly to the digital environment's fragmentation of shared reality.
Social media platforms, designed to maximize engagement through outrage and division, have flooded the world with misinformation while making consensus increasingly impossible. The promise that digital technology would connect humanity has instead produced the opposite result.
"That, I think, is what digital technology has done to us," Haidt said. "It was supposed to connect us, but instead it has broken things, divided us, and made it very, very hard to ever have common facts, common truths, common stories again."
The Coming AI Acceleration
Looking forward, Haidt offered little comfort. Rather than solving these problems, he speculated that artificial intelligence will likely accelerate humanity's cognitive and psychological decline.
"AI is not exactly going to make us better at interacting with human beings," he observed.
As machines increasingly handle thinking tasks, humans may further atrophy the very capacities that distinguish them—attention, deep reasoning, and authentic social connection.
'We Need to Disenthrall Ourselves'
Despite the grim assessment, Haidt insisted that humanity retains the power to reverse these trends. The solution, he argued, requires conscious human agency rather than technological fixes.
"We need to disenthrall ourselves from technology," Haidt said, paraphrasing Abraham Lincoln. He urged the development of "a generally negative view of social media and of AI"—not Luddism, but a more skeptical relationship with tools designed to capture and monetize human attention.
Introduced by MIT President Sally Kornbluth, who called Haidt "a leading voice for reforming society's relationship with technology," the lecture concluded with practical proposals drawn from Haidt's advocacy work.
His four recommended reforms include:
- No smartphones for children before high school
- No social media access until age 16
- Phone-free schools from first bell to last
- More independence, free play, and real-world responsibility for young people
A Growing Global Backlash
Haidt expressed optimism that change is already underway. School districts across the United States are implementing phone bans. Australia recently instituted a social media ban for those under 16, and several other countries have announced similar measures.
"There's a gigantic techlash happening right now," Haidt noted. For all the sudden changes technology has introduced within the last 15 years, he believes people can still find a way out of our tech-induced predicament.
"The good news is, there is human agency," Haidt concluded. "People see a problem, they figure out a way around it. That's what I'm hoping to promote here. So please consider what I'm saying, these trends, and then work to change them."
The Karl Taylor Compton Lecture Series, named for MIT's ninth president who led the Institute from 1930 to 1948, has brought influential thinkers to campus since 1957. Haidt's lecture, titled "Life After Babel: Democracy and Human Development in the Fractured, Lonely World That Technology Gave Us," continues that tradition of examining society's most pressing challenges through rigorous scholarship.