Young adults who spend long hours passively consuming online content are more likely to report problems with concentration, memory and focus, according to recent research and surveys that shed light on the phenomenon often called "brain rot." The term, popularised in recent years and named Oxford Dictionary’s word of the year in 2024, refers to the flattened, distracted mental state people describe after hours of scrolling.
Rising self-reports of cognitive difficulty
In 2025 researchers at Yale University surveyed cognitive function across age groups and found a worrying increase among younger people: almost 10% of those aged 18 to 34 reported some form of cognitive disability, a rate the study said was nearly double the figure recorded in 2013. The rise has prompted researchers to explore environmental causes rather than diseases or injury.
“that indiscriminate digital expansion has weakened learning environments rather than strengthened them.”
The quote above appears in written testimony by a neuroscientist to the United States Senate and captures the central concern: widespread, unstructured digital use may be altering how young people learn and think.
How scientists are testing the idea
A team at Karabük University in Turkey sought to move beyond anecdote by combining surveys of behaviour with cognitive testing. The researchers drew on cognitive load theory, a long-established idea in cognitive psychology that humans have a limited capacity for working memory — the short-term storage and manipulation of information needed for reasoning, learning and decision-making.
The Turkish team surveyed nearly 500 young adults about their online habits and assessed their mental capacities. More than half of respondents reported spending at least five hours a day online. The investigators found a strong association between heavier online consumption and measures of cognitive difficulty consistent with the predictions of cognitive load theory: passive, fragmented online input appears to tax working memory and reduce the resources available for sustained attention and learning.
- Working memory limits: Cognitive load theory explains why high volumes of scattered information overload short-term memory.
- Passive consumption: Long periods of low-effort scrolling were linked to feelings of being scattered and reduced concentration.
- Self-reported rise: Surveys suggest a near doubling of self-reported cognitive disability among 18–34-year-olds since 2013.
What the findings mean — and what they do not
These results are not evidence that screens per se cause permanent brain damage. Rather, they point to mechanisms by which habitual, low-engagement online behaviour can impair short-term cognitive performance. Working memory is finite; when it is repeatedly taxed by brief, attention-fragmenting stimuli — notifications, endless feeds, rapid context switches — there is less capacity for deliberate learning, planning and focused thought.
That distinction matters. The available studies describe associations and plausible laboratory mechanisms, not a single, definitive causal chain from screen time to irreversible cognitive decline. The researchers caution against oversimplifying: digital tools can support learning when used intentionally, but indiscriminate, prolonged passive use appears to deliver mental costs.
| Finding | Reported figure |
|---|---|
| 18–34-year-olds reporting cognitive disability (2025) | ~10% |
| Increase relative to 2013 | Nearly double |
Practical advice for readers
The emerging picture suggests practical steps that may mitigate short-term harms while preserving the benefits of digital access. These include:
- Setting intentional time blocks for focused work with notifications silenced.
- Active consumption — reading longer-form material or engaging in productive online tasks — rather than passive scrolling.
- Regular offline breaks to allow working memory to recover and to practise longer attention spans.
For policymakers and educators the research highlights the importance of designing learning environments that limit unnecessary cognitive load and teach digital habits that support, rather than erode, attention and memory. As the academic community continues to gather data, the prudent response is to balance the clear benefits of the internet with simple behavioural measures that protect cognitive capacity.
