That's a very good point. From my own experience, you can see dramatic improvements with abstinence/drastic reduction in short period of time (weeks to months) but, as with damage from substance abuse, healing may take place for months to years, and perhaps some of the damage is permanent due to developmental windows being lost.

The interesting thing that I see when a child or teen is screen-free for prolonged period is that the frontal lobe seems to mature in leaps and bounds, as if it's been liberated. Since we're not dealing with an actual chemical irritating the brain (vs alcohol or drugs), the recovery may be quicker and more complete.

A lot probably depends on how much/how long exposure there has been, plus how healthy other aspects of the individual's environment are.

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