That’s as test scores in math and reading tanked after schools ditched textbooks in favor of screens. But the effect of computers and tablets on education goes beyond the basics of the so-called three R’s.

“Elementary school always taught more than reading and mathematics. Children learned how to wait for someone else’s idea to be expressed before sharing their own, to negotiate disagreements and explain their thinking,” University of Pennsylvania Graduate School of Education professor Sarah Schneider Kavanagh and University of Portland School of Education professor Katie A. Danielson wrote in a Washington Post op-ed earlier this month.

Such lessons are actually a critical aspect of growing up, as children’s cognition has been shown to mature via person-to-person interactions, not just from receiving information, they added

But classroom computers and adaptive software now provide individualized instruction to many students. While that offers benefits, Kavanagh and Danielson warned there are also trade-offs.

For example, when students merely click through math lessons on their own instead of solving problems with classmates, they don’t hear different ways of thinking.

That kind of collective learning is especially important in the era of AI as distinctly human skills like attention span, curiosity, judgment, empathy and collaboration become more valuable, Kavanagh and Danielson argued.

“Children don’t need school to become more like the digital world,” the professors wrote. “They are already immersed in that world for much of the time outside school hours. They need a place designed for other aims, such as conversation instead of consumption and collaboration instead of personalization. That isn’t resisting the future; it’s preparing children to be fully human in it.”

Computers and online learning saw steadily expanded use in classrooms for decades, then they became essential during COVID-19 lockdowns. But rather than revert to pre-pandemic ways afterward, schools continued to relying heavily on them.

There’s now a growing backlash. According to one tally, lawmakers in at least 17 states had introduced or debated legislation related to devices or screens in classrooms as of July.

And earlier this year, the nation’s second largest school district, Los Angeles Unified, banned in-school screen use for students in preschool through first grade and curbed screen time for older students.

There’s growing evidence that devices not only hurt test scores but children’s ability to think.

Earlier this year, in written testimony before the U.S. Senate Committee on Commerce, Science, and Transportation, neuroscientist Jared Cooney Horvath said Gen Z is less cognitively capable than previous generations, despite its unprecedented access to technology.

He said Gen Z is the first generation in modern history to score lower on standardized tests than the previous one, citing a stark correlation in scores and time spent on computers in school.

While skills measured by these tests aren’t always indicative of intelligence, they are a reflection of cognitive capability, which Horvath said has been on the decline over the last decade or so.

“We’re facing challenges more complex and far-reaching than any in human history—from overpopulation to evolving diseases to moral drift,” he told Fortune‘s Sasha Rogelberg. “Now, more than ever, we need a generation able to grapple with nuance, hold multiple truths in tension, and creatively tackle problems that are stumping the greatest adult minds of today.”