And that's leaving aside the question of what it would affect. Elasticity/learning? Would it result in forgetting, or losing skill? Apart from the problem that I (and others with me) have with the "area X does Y" school of neuro-cognition, measuring changes in activity does not measure changes in connections, synapses, or tissue.

It is possible that inhibiting certain brain areas for a longer period will change e.g. cognitive skills. There is enough literature on losing skills after inactivity. But this approach can't bridge the gap.

It makes more sense to observer TikTok users' behavior over time. That can give more information about the actual effects, although without nice, colorful blobs.