[chunpaiyang]

I'm curious about the true logic behind the claim that tablet use lower grades. What is the underlying logic ?

For my own kid, I do limit screen time just because their eyes are still fragile before age 9, not because the above reason.

I asked an AI about the reasoning and the answer comes down to: kids need real-world interaction to support brain development. But if that's the case, aren't these two seperate issues? Using a tablet doesn't damage your brain ... it's just a low-value activity that fails to build the good skills (like video games?) that other activities do. It is not that screens make you dumber, it is that they crowd out the things that make you smarter.