Brain rot

A few minutes before going to sleep, you open your phone and begin watching short videos. One shows a man arguing with a delivery driver, the next explains three supposed signs of high intelligence, then comes a football goal, a joke, a fragment of a podcast, a conspiracy theory, a recipe, a celebrity interview, and a video of someone cutting a bar of soap into perfectly even pieces. Twenty minutes later, you have encountered more subjects than a newspaper might place on its front page, yet if someone asked what you learned, the answer might be surprisingly difficult to give.

The experience has acquired a popular name: brain rot. People use the expression when they feel that too much trivial, repetitive, absurd, or hyperstimulating online content has left their mind somehow worse than before. The phrase is deliberately exaggerated, which is part of why it spread so successfully, but underneath the joke lies a serious question: can the kind of information we repeatedly consume influence the way we use our attention and think?

Before answering that question, we need to remove one misunderstanding. Brain rot is not a recognized neurological diagnosis, and watching TikTok does not literally cause your brain to rot. There is no established disease in which short videos gradually decay brain tissue, so anyone using the term as if doctors had identified a new form of neurological degeneration is turning a cultural expression into a scientific claim that the evidence does not support.

Discarding the literal interpretation, however, does not make the underlying question meaningless. A term can be scientifically imprecise while describing an experience that deserves investigation, just as people used words for stress, exhaustion, or sleeplessness long before researchers developed precise ways to study them. The useful task is therefore not to ask whether “brain rot” exists as a disease but to separate the different behaviours hidden inside the expression and examine what we actually know about them.

Start with the content itself. A short video is not inherently shallow, just as a long book is not inherently intelligent, because duration tells us very little about intellectual value on its own. A skilled teacher can explain an elegant mathematical idea in sixty seconds, while a four-hundred-page book can spend an extraordinary amount of time saying almost nothing. The same applies to entertainment. A ridiculous video of a cat may provide exactly what you wanted after a difficult day, and there is no intellectual duty requiring every minute of your life to improve your knowledge. The relevant distinction is not serious content versus entertainment, because both can have value; it is whether the content serves a purpose you actually chose and whether the amount of it remains proportionate to that purpose.

This passage is from Scroll on Purpose. Read the introduction and first chapter, browse the guides, or see buying options.