Oxford University Press named "brain rot" its Word of the Year on 2 December 2024, after a public vote with more than 37,000 participants and an analysis of usage data by its lexicographers. Usage of the term rose 230 percent between 2023 and 2024.
Oxford defines it as the supposed deterioration of a person's mental or intellectual state, linked to overconsuming online content seen as trivial or unchallenging. The word "supposed" is the dictionary's own. The phrase describes a worry, and a good dose of self-mockery, rather than a diagnosis.
Where does the term brain rot come from?
Its earliest recorded use is in Henry David Thoreau's Walden from 1854. Thoreau complained that society preferred simple ideas to complex ones and compared this decline in mental effort to the potato rot then hitting England. About 170 years later the phrase took off on TikTok among Gen Z and Gen Alpha, the same generations producing much of the content it mocks.
What does research say about short videos and attention?
The broadest picture so far is a meta-analysis by Lan Nguyen and colleagues at Griffith University, published in Psychological Bulletin in September 2025. It pooled 71 studies with 98,299 participants. Heavier short-form video use went along with weaker scores on cognitive measures, with an average correlation of r = -0.34. The strongest links were with attention (-0.38) and inhibitory control (-0.41).
Inhibitory control is the ability to stop a first impulse: not reaching for the phone when it buzzes, not drifting to another thought halfway through a problem. A correlation of -0.34 is moderate. Knowing someone's viewing habits tells you something about their attention score, but nowhere near enough to predict it. The same analysis linked heavier use with more anxiety, stress and sleep problems, yet found no overall link with body image or self-esteem.
Do short videos cause attention problems, or the other way round?
These studies cannot say. Most were cross-sectional, measuring people at a single point in time. Someone who already struggles to focus may be drawn to short videos, and the authors note that the two directions could feed each other. Only a small share of the studies controlled for general social media use, so it is unclear how much belongs to the short-video format itself.
One detail reported in coverage of the paper is worth keeping: the link looked weaker in studies that measured only time spent and stronger in those using addiction-style scales, which capture loss of control. "Can I stop when I want to?" may be as useful a question as "how many hours a day?"
What does this mean when you study?
A short-video feed has no natural end. One clip finishes, the next starts by itself, which is why a five-minute break so often turns into thirty. That is less about willpower than about design, and the practical answer is design of your own: phone in another room during study blocks, autoplay off, breaks spent standing up or getting water. Our piece on fragmented attention and cognitive resilience goes into how to set up those blocks.
How can you check your own attention?
The Stroop task is a classic measure of inhibitory control: the word "blue" appears in red ink, and you name the ink colour, not the word. Holding back the urge to read is the whole test. Our Stroop test and attention test take a few minutes each.
For a small personal experiment, take one of them at the same time each day for two weeks, with the phone out of the room during study in one week and on the desk in the other. It is not a diagnosis, and sleep or mood will move the numbers too. Still, the difference between your own two weeks can say more about you than any meta-analysis average.