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What Is Brain Rot (And Is Social Media Actually Causing It?)

Isaac Vesterfelt

Oxford's 2024 word of the year, explained — and what the research actually says about short-form video and attention.

If you’ve spent any time around Gen Z or Gen Alpha lately, you’ve probably heard the term. Someone sends you a Skibidi Toilet meme at 11pm. You open TikTok for what feels like two minutes and look up to find it’s been forty-five. Your brain feels like it’s been microwaved. That’s brain rot.

Oxford crowned it Word of the Year in 2024, which tells you something about how fast it crossed from niche internet slang into the mainstream cultural vocabulary. Usage of the term increased by 230% from 2023 to 2024 alone. At this point, even Pope Francis has weighed in, warning against what he called “putrefazione cerebrale” during a 2025 address.

So, is brain rot real? And if it is, is social media causing it?

The honest answer is: kind of, and sort of, and the specifics matter more than the headline.

Where the term actually comes from

Here’s a detail that surprises most people: the first recorded use of “brain rot” wasn’t from some Gen Alpha Discord server. It was Henry David Thoreau, in Walden, published in 1854.

Thoreau wrote that while England endeavors to cure the potato-rot, we might also endeavor to cure the brain-rot, which prevails so much more widely and fatally.

He was criticizing a culture that preferred trivial ideas over meaningful ones. A tendency, in his view, to consume whatever was easy and familiar rather than what was challenging and worthwhile.

Which is to say: every generation has had some version of this worry. William Wordsworth criticized “frantic novels” in 1800. Virginia Woolf wrote about the mental effects of cinema. The 1950s had hand-wringers about television. The 1990s had video game panic. The concern isn’t new. What’s new is the mechanism.

What “brain rot” actually means in 2024

Modern brain rot has two layers, and linguist Adam Aleksic captures this well. On one level, it describes the content itself: low-quality, repetitive, algorithmically-optimized short-form videos that are funny in a way you can’t quite explain and forget immediately after watching. Skibidi Toilet. The Rizzler. Sludge content. Stuff that is, by design, easy to consume and impossible to stop consuming.

On another level, brain rot describes what that content allegedly does to you over time: dulls your ability to focus, shortens your patience for slower things, makes sustained reading or thinking feel more effortful.

Aleksic makes an important point about the language aspect: saying “skibidi” isn’t itself brain rot. Your brain processes slang the same way it processes Shakespeare. What makes something brain rot is the context it comes from, specifically, short-form algorithmic video consumed in high volumes without intention. The words are just the most visible symptom of the underlying pattern.

What the research actually shows

Here’s where it gets more interesting, and more complicated.

A large review published in Psychological Bulletin in 2025, covering 71 studies and nearly 100,000 participants, found that heavy consumption of short-form video was associated with lower cognitive performance, particularly in attention and impulse control. It also found links to higher rates of depression, anxiety, stress, and loneliness.

That’s a meaningful finding. But it comes with an important caveat: most of these studies are correlational and describe only a moment in time. They can tell us that heavy short-form video use and attention difficulties tend to show up together. They can’t yet tell us which causes which, or whether the effects are permanent.

James Jackson, a neuropsychologist at Vanderbilt, put it well: the narrative that only out-of-touch people worry about this is too simple, but the narrative that short-form video is definitely, provably rotting everyone’s brain is also too simple. The picture is more nuanced, and the research is still catching up to the phenomenon.

Dr. Nidhi Gupta, a pediatric endocrinologist who researches screen time effects, offered a useful analogy: short-form video content is “video games and TV on steroids.” She’s not claiming permanent doom, but she notes that the research timeline for comparable concerns about alcohol and cigarettes took 75 years to fully develop. We’re early.

Gloria Mark’s data is harder to dismiss

Where the research gets harder to wave away is Gloria Mark’s attention span work. Mark is a professor of informatics at UC Irvine who has spent two decades measuring, in real-world settings, how long people actually sustain focus on a digital screen.

In 2004, the average was about 150 seconds. By 2012, it had fallen to 75 seconds. Her most recent measurements place it at around 47 seconds.

That’s not a survey asking people how long they think they focus. That’s observational research conducted in real environments. And the trend line is consistently downward over twenty years.

Mark’s nuanced point, and it’s the right one, is that this isn’t about phones destroying brains. It’s about attention being a trainable, adaptable resource. When the environment consistently rewards rapid switching, frequent interruption, and fast stimulation, attention adapts accordingly. The brain learns to expect shorter rewards. Slower things start to feel harder, not because you’ve become cognitively damaged, but because your attentional habits have shifted.

This phenomenon is exactly the habit science from an earlier post in this series: repetition in a consistent context builds stimulus-response associations. An algorithm that delivers a new piece of stimulation every few seconds is training your attention to expect stimulation every few seconds. That’s not permanent rot, but it isn’t nothing either.

The actual problem isn’t social media, it’s the feed

Here’s the distinction that most “brain rot” coverage misses, and it’s the one that matters most for what you can actually do about it.

Research suggests the following: passive consumption of algorithmically-curated content is the pattern most consistently associated with negative outcomes. Active use, messaging friends, posting intentionally, having real interactions with people you actually know, shows a much weaker negative signal, and sometimes a positive one.

Brain rot, to the extent it’s real, is not caused by “social media” as a category. It’s caused by a specific kind of social media use: sitting in an algorithmic feed designed to deliver maximum stimulation with minimum friction, for as long as possible, with no natural stopping point.

A researcher named Alexander Serenko described brain rot content as having specific features: emotional intensity, brevity, familiar characters, ease of understanding, and repetition. Those aren’t random. Those are the exact features an engagement-maximizing algorithm selects for when it’s deciding what to show you next. The content is not rot by accident. It’s rot by design, because that’s what keeps you watching.

Thoreau’s 1854 version of this complaint was about a culture that preferred easy ideas over hard ones. What’s new in 2024 is that the selection mechanism has been automated, scaled to billions of users, and optimized over years of behavioral data. The preference for easy stimulation isn’t just a human tendency anymore. It’s being actively engineered.

So what do you do with this?

A few things are worth taking away from this information.

First, “brain rot” as a concept is real enough to take seriously, and the research, while still early, is pointing in a consistent direction. Heavy passive consumption of short-form algorithmic content is associated with attention difficulties, impulse control issues, and worse mental health outcomes.

Second, the response that most people reach for, limiting screen time, deleting apps, going on a digital detox, treats the symptom rather than the source. Mark herself makes this point: the goal isn’t to stop using digital tools, it’s to change your relationship with them. Attention can be trained in both directions. The same way an algorithm trains you toward fragmented focus, intentional practice can train you back toward sustained attention.

Third, and this part is the piece most coverage misses, the distinction between passive and active use is the most important variable. The same phone, the same app, the same account can be a brain rot machine or a genuine communication tool depending entirely on how you’re using it. Watching 45 minutes of algorithmically-selected Reels from strangers is a categorically different activity from messaging your family or following a handful of accounts you deliberately chose.

The algorithm doesn’t make that distinction. It just serves content. The question of whether you’re doing the first thing or the second is entirely up to you, and right now, most of the tools available don’t make that distinction easy to maintain.

That’s the gap we’re trying to close.

A note on the research: the science on short-form video and cognition is real but still developing. If you’re concerned about your own attention patterns or your child’s, it’s worth talking to a professional rather than drawing conclusions from population-level studies alone.

Sources:

brain rot attention research

Reroute helps you open social media with intention, not impulse.