August 19, 2026

TikTok’s “brain rot” joke just got an MRI—and the picture isn’t flattering. In a Zhejiang University study of 56 young adults, short-form videos they liked lit up a reward loop while shutting down the brain’s self-control centers below resting baseline, suggesting the scroll can override the very circuits meant to make you stop. Researchers say higher glutamate in the dACC may offer some protection, but the takeaway is blunt: the content gets through, and the brakes go quiet.

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