Short Videos Quiet the Brain's Self-Control Center — and That's Why You Can't Stop Watching

A new brain-scan study from Zhejiang University reveals that watching short videos you enjoy temporarily deactivates the brain regions responsible for self-control and long-term planning. The findings, published in NeuroImage in January 2026, provide the first direct neural evidence of how platforms like TikTok and Instagram Reels hijack the brain's cognitive control network.

The research team examined 56 young adults using functional MRI combined with proton magnetic resonance spectroscopy (H-MRS). Participants watched short video clips inside the scanner, and the researchers tracked brain activity in real time. When viewers liked a clip enough to watch it to completion, two key regions — the dorsal anterior cingulate cortex (dACC) and the dorsolateral prefrontal cortex (dlPFC) — showed significant deactivation. These areas are critical for cognitive control, the mental process that helps people balance immediate rewards against longer-term goals.

Impairments in this system are linked to conditions such as depression, anxiety, ADHD, and addiction. Short-video platforms are designed for continuous, low-effort consumption, with algorithmically curated streams that deliver a steady stream of rewarding content. Prior behavioral studies have tied internet and smartphone addiction to weaker self-control, and separate neuroimaging work has documented disruptions in reward and cognitive-control circuits in people with behavioral addictions. However, few studies had directly tested whether the act of watching entertaining short videos itself triggers these neural changes.

The study's authors note that the effect is temporary, but repeated exposure may gradually weaken cognitive control, making individuals more susceptible to addictive behaviors. The findings also explain why users find it so difficult to stop scrolling: the brain literally quiets the regions that would normally help them resist the pull of instant gratification. This neural mechanism, the researchers suggest, could be a key factor in the growing prevalence of screen time addiction and its associated mental health risks.